The problem with your post is that it's illogical and goes against scripture.
The Bible teaches that we have the right to self defense,
Exodus 22:2: "If the thief is caught while breaking in, and is struck so that he dies, there will be no blood guiltiness on his account."
The Bible also tells us to protect the innocent,
Deut. 19:10, "So innocent blood will not be shed in the midst of your land which the Lord your God gives you as an inheritance, and blood guiltiness be on you."
We also have a commandment to love our neighbor as the second greatest commandment.
What you; however, are advocating is that Christians violate scripture and evilly stand by watching innocent neighbors murdered by evil deceived murderers without stopping it.
Furthermore, war is not a sin in itself since in the Old Testament God sends people into war:
"Then the Lord spoke to Moses in the plains of Moab by the Jordan opposite Jericho, saying, 51 "Speak to the sons of Israel and say to them, "When you cross over the Jordan into the land of Canaan, 52 then you shall drive out all the inhabitants of the land from before you, and destroy all their figured stones, and destroy all their molten images and demolish all their high places; 53 and you shall take possession of the land and live in it, for I have given the land to you to possess it," (
Num. 33:50-53).
Going to war is not wrong it itself and a Christian can go to war under the right circumstances.
And note the commandment "Thou shalt not kill" is not as general as the King James version would indicate. The commandment actually refers to premeditated, unjustified murder... an evil act that you would stand by and watch happen without lifting a finger to try and stop. I hope you never are my neighbor.
In the Old Testament, God ordered the extermination of entire cities full of the most wicked people imaginable and He did so in righteous judgment due to their extreme wickedness which included the mixing of occultic practices with blatant sexual immorality of the highest order which included sacrificing their children to demons.
But God did not destroy the righteous along with the wicked. He demonstrated this principle by saving righteous people from Sodom and Jericho prior to their destruction. The charge that God indiscriminately murdered people does not hold to to critical evaluation of the biblical texts. It was a holy judgment to prevent a cycle of extreme reprobate wickedness from propagating generation to generation. His holiness and love required that the cycle be broken and since the people would not repent, they were judged.
You'll have to give an account to God someday why you violated His Word and advocated that Christians, the salt and light of the world, could not use deadly force to stop the murder of innocent people after God said we should when necessary.