It wasn't until the late 20th and early 19th century that socialists and so-called "progressives" tried to re-interpret the Second Amendment to mean a collective right to form state militias.
Dred Scott v. Sandford ruled that the Second Amendment is an individual right, however it also ruled that the Second Amendment did not apply to slaves.
United States v. Cruikshank,
Presser v. Illinois and
Miller v. Texas ruled that the Second Amendment is an individual right, however, it also ruled that the First and Second Amendments only limit the federal government.
United States v. Miller ruled that that: "These show plainly enough that the Militia comprised all males physically capable of acting in concert for the common defense," which is to say that the people consist of the militia.
United States v. Verdugo-Urquidez ruled that the Second Amendment (and the Bill of Rights in general) was an individual right that also applied to non-citizen aliens.
United States v. Lopez ruled that the so-called "Gun-Free School Zones Act of 1990" violated the Second Amendment and was unconstitutional.
United States v. Emerson,
District of Columbia v. Heller and
McDonald v. Chicago reaffirmed that the Second Amendment refers to an individual right that applies to state and local governments, as well as the federal government.
Moore v. Madigan ruled that the ban on concealed carry in Illinois violated the Second Amendment and was thus unconstitutional, requiring Illinois to adopt concealed carry.
Lets also take a look at what the Founding Fathers had to say about the Second Amendment and right to bear arms:
"A strong body makes the mind strong. As to the species of exercises, I advise the gun. While this gives moderate exercise to the body, it gives boldness, enterprise and independence to the mind. Games played with the ball, and others of that nature, are too violent for the body and stamp no character on the mind. Let your gun therefore be your constant companion of your walks." -Thomas Jefferson
"One loves to possess arms, though they hope never to have occasion for them." -Thomas Jefferson
"We established however some, although not all its [self-government] important principles . The constitutions of most of our States assert, that all power is inherent in the people; that they may exercise it by themselves, in all cases to which they think themselves competent, (as in electing their functionaries executive and legislative, and deciding by a jury of themselves, in all judiciary cases in which any fact is involved,) or they may act by representatives, freely and equally chosen; that it is their right and duty to be at all times armed;" -Thomas Jefferson
"No freeman shall ever be debarred the use of arms." -Thomas Jefferson
"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -Benjamin Franklin
"To model our political system upon speculations of lasting tranquility, is to calculate on the weaker springs of the human character." -Alexander Hamilton
"[The Constitution preserves] the advantage of being armed which Americans possess over the people of almost every other nation...(where) the governments are afraid to trust the people with arms." -James Madison
"To suppose arms in the hands of citizens, to be used at individual discretion, except in private self-defense, or by partial orders of towns, countries or districts of a state, is to demolish every constitution, and lay the laws prostrate, so that liberty can be enjoyed by no man; it is a dissolution of the government. The fundamental law of the militia is, that it be created, directed and commanded by the laws, and ever for the support of the laws." -John Adams
"Before a standing army can rule, the people must be disarmed; as they are in almost every kingdom in Europe. The supreme power in America cannot enforce unjust laws by the sword; because the whole body of the people are armed, and constitute a force superior to any band of regular troops that can be, on any pretence, raised in the United States. A military force, at the command of Congress, can execute no laws, but such as the people perceive to be just and constitutional; for they will possess the power, and jealousy will instantly inspire the inclination, to resist the execution of a law which appears to them unjust and oppressive. " -Noah Webster
"Who are the militia? Are they not ourselves? Is it feared, then, that we shall turn our arms each man gainst his own bosom. Congress have no power to disarm the militia. Their swords, and every other terrible implement of the soldier, are the birthright of an American...[T]he unlimited power of the sword is not in the hands of either the federal or state governments, but, where I trust in God it will ever remain, in the hands of the people." -Tenche Coxe
"[The new government] shall be too firmly fixed in the saddle to be overthrown by anything but a general insurrection." -William Symmes
"[A standing army] if raised, whether they could subdue a nation of freemen, who know how to prize liberty, and who have arms in their hands?" -Theodore Sedwick
"[W]hereas, to preserve liberty, it is essential that the whole body of the people always possess arms, and be taught alike, especially when young, how to use them; nor does it follow from this, that all promiscuously must go into actual service on every occasion. The mind that aims at a select militia, must be influenced by a truly anti-republican principle; and when we see many men disposed to practice upon it, whenever they can prevail, no wonder true republicans are for carefully guarding against it." -Richard Henry Lee
"Guard with jealous attention the public liberty. Suspect every one who approaches that jewel. Unfortunately, nothing will preserve it but downright force. Whenever you give up that force, you are ruined." -Patrick Henry
"O sir, we should have fine times, indeed, if, to punish tyrants, it were only sufficient to assemble the people! Your arms, wherewith you could defend yourselves, are gone...Did you ever read of any revolution in a nation...inflicted by those who had no power at all?" -Patrick Henry
"[W]hen the resolution of enslaving America was formed in Great Britain, the British Parliament was advised by an artful man, who was governor of Pennsylvania, to disarm the people; that it was the best and most effectual way to enslave them; but that they should not do it openly, but weaken them, and let them sink gradually...I ask, who are the militia? They consist of now of the whole people, except a few public officers. But I cannot say who will be the militia of the future day. If that paper on the table gets no alteration, the militia of the future day may not consist of all classes, high and low, and rich and poor..." -George Mason
"[T]he people are not to be disarmed of their weapons. They are left in full possession of them." -Zacharia Johnson
"That the people have a right to keep and bear arms; that a well-regulated militia, composed of the body of the people, trained to arms, is the proper, natural, and safe defence of a free state; that standing armies, in time of peace, are dangerous to liberty, and therefore ought to be avoided as far as the circumstances and protection of the community will admit; and that, in all cases, the military should be under strict subordination to, and governed by, the civil power." -Virginia delegation to the constitutional convention
"The whole of that Bill [of Rights] is a declaration of the right of the people at large or considered as individuals...
t establishes some rights of the individual as unalienable and which consequently, no majority has a right to deprive them of." -Albert Gallatin
"[C]onceived it to be the privilege of every citizen, and one of his most essential rights, to bear arms, and to resist every attack upon his liberty or property, by whomsoever made. The particular states, like private citizens, have a right to be armed, and to defend, by force of arms, their rights, when invaded." -Roger Sherman
As you can clearly see, gun control is not only a failure, but it also takes away our freedom and is unconstitutional. What can we do to lower violent crime rates then? That is a good question and the answer to the question doesn't include gun control. I believe we should primarily focus on the causes of violent crime, as opposed to focusing on the symptoms. We need to overhaul our public education system and work to eliminate poverty. As for guns, we should protect the right of the people to bear arms, including the right to concealed carry. We should also bring back firearms classes in public schools, these classes would teach our young people about gun safety and responsibility.
Sources
http://www2.law.ucla.edu/volokh/beararms/statecon.htm
https://supreme.justia.com/us/92/542/case.html
https://supreme.justia.com/us/116/252/case.html
https://supreme.justia.com/us/307/174/case.html
http://www.supremecourt.gov/opinions/07pdf/07-290.pdf
http://www.supremecourt.gov/opinions/09pdf/08-1521.pdf
https://supreme.justia.com/us/60/393/case.html
http://supreme.justia.com/cases/federal/us/153/535/case.html
http://www.justfacts.com/guncontrol.asp
http://www.americanbar.org/content/..._PetitionerAmCuHeartlandInst.authcheckdam.pdf
http://www.collegiatetimes.com/stor...ow-concealed-carry-saves-many-lives-takes-few
http://rds.homeoffice.gov.uk/rds/pdfs10/hosb0110.pdf
http://www.ontheissues.org/2012/Barack_Obama_Gun_Control.htm
http://www.prnewswire.com/news-releases/research-concealed-carry-and-guns-save-lives-95307939.html
http://www.nydailynews.com/opinion/concealed-weapons-save-lives-article-1.1121161
http://www.guncite.com/gc2ndfqu.html
http://www.aljazeera.com/news/americas/2012/12/20121218132050819.html
http://en.wikisource.org/wiki/Bill_of_Rights_1689