The 2nd Amendment and the ownership of guns isn't a problem, it's a protection. And, the protection isn't just for an individual protecting himself or family, it's a protection against an oppressive, totalitarian government. Our Declaration of Independence stated it well, and the principle still applies:
"“... That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to affect their Safety and Happiness...When a long train of abuses and usurpations, pursuing invariably the same Object, evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new Guards for their future security.”
Trying to explain that to Europeans, who have a long history of tolerating dictators, is almost always a waste of time.