Scripture does in fact tell us not to use violence and this is not conditional on the situation; thus applicable when being in the presence of someone being beaten or in danger. Our reaction should be self sacrificial not sacrificing someone else.
Jesus did not protect the helpless disciples spreading the word about Him. They were tortured and murdered. They could have live longer spreading the gospel.
Matthew 5:39
But I say to you, do not resist an
evil person
Luke 6:35
But love your enemies, and do good, and lend, expecting nothing in return; and your reward will be great, and you will be sons of the Most High; for He Himself is kind to ungrateful and
evil men.
Romans 12:17
Never pay back
evil for
evil to anyone.
"Never" and "Anyone" are absolute terms
Romans 12:21
Do not be overcome by
evil, but overcome
evil with good.
Clearly violence is evil and to defeat it God says to use good
1 Thessalonians 5:15
See that no one repays another with
evil for
evil, but always seek after that which is good for one another and for all people.
Romans 12:1
Therefore I urge you, brethren, by the mercies of God, to present your bodies a living and holy
sacrifice, acceptable to God,
which is your spiritual service of worship.
Ephesians 5:1-2
Therefore be imitators of God, as beloved children; and walk in love, just as Christ also loved you and gave Himself up for us, an offering and sacrifice to God as a fragrant aroma
Someone physically harming a stranger is an enemy of mine and I would expect them to be an enemy of anydecent person. God speaks much about loving our enemies and how we treat them.
I want as much as anyone to dish out retribution to evil, mean, violent people; I just don't see Jesus doing that.
I see your point regarding calling the police and have a problem with the whole idea because I don't have a good answer or understanding about it. I may call the police, I just don't know.
Here's a passage or two you missed:
Jos 6:21 They devoted the city (Jericho) to the LORD and destroyed with the sword every living thing in it—men and women, young and old, cattle, sheep and donkeys.
Jos 8:24 When Israel had finished slaughtering all the inhabitants of Ai in the open wilderness where they pursued them and all of them to the very last had fallen by the edge of the sword, all Israel returned to Ai, and smote it with the edge of the sword.
Jos 10:28 And Joshua took Makke'dah on that day, and smote it and its king with the edge of the sword; he utterly destroyed every person in it, he left none remaining; and he did to the king of Makke'dah as he had done to the king of Jericho.
Jos 10:30 and the LORD gave it also and its king into the hand of Israel; and he smote it with the edge of the sword, and every person in it; he left none remaining in it; and he did to its king as he had done to the king of Jericho.
Jos 10:32 and the LORD gave Lachish into the hand of Israel, and he took it on the second day, and smote it with the edge of the sword, and every person in it, as he had done to Libnah.
Jos 10:35 and they took it on that day, and smote it with the edge of the sword; and every person in it he utterly destroyed that day, as he had done to Lachish.
Jos 10:37 and took it, and smote it with the edge of the sword, and its king and its towns, and every person in it; he left none remaining, as he had done to Eglon, and utterly destroyed it with every person in it.
Jos 10:39 and he took it with its king and all its towns; and they smote them with the edge of the sword, and utterly destroyed every person in it; he left none remaining; as he had done to Hebron and to Libnah and its king, so he did to Debir and to its king.
Jos 11:12 And all the cities of those kings, and all their kings, Joshua took, and smote them with the edge of the sword, utterly destroying them, as Moses the servant of the LORD had commanded.
Jos 11:14 And all the spoil of these cities and the cattle, the people of Israel took for their booty; but every man they smote with the edge of the sword, until they had destroyed them, and they did not leave any that breathed.
Why would God order that level of slaughter?
Gen 15:16 And they (Abraham's descendants) shall come back here in the fourth generation; for the iniquity of the Amorites is not yet complete.
God was giving the Amorites about 500 years to repent of their detestable practices. They didn't.
What did they do?
Deu 12:31b ... for every abominable thing which the LORD hates they have done for their gods; for they even burn their sons and their daughters in the fire to their gods.
God also said to Israel: "You must purge the evil from among you." (DT 13:5; 17:7, 12; 19:19; 21:21; 22:21, 22, 24; 24:7)