Show me where self defense is in the Bible, for a person (not talking an army or the country) and I will agree with you. Actually, show me in the New Testament where Jesus said any where it is ok to take the life of another person. Even in self defense, or in defense of your family. (Yes, defending my family would be a hard one, but I would have to trust God, because there is never going to be a weapon like a gun in my house ever!) Trusting God, rather than chariots or horses is what it is all about. This is from Isaiah, and repeated in Psalms. Chariots and horses are weapons of war. Technically, even the people of Israel were not to trust in their weapons for self defense, but to trust in the Lord.
I stated earlier that if someone threatened the life of my child I would shoot them. I would. That does not mean I would kill them.
Self defense is not vengence. It isn't hatred. It is what a person feels they need to do when they have no other choice. It can be deadly, but that isn't always the case. Self defense is protecting oneself from injury at the hand of others. Normally the "others" are evil.
If I know a type of danger is coming, and I decide to be "peaceful" and not warn anyone, or do anything to prevent it and others are harmed then I am guilty for the death or injury of victims.
Keep in mind that self defense comes in many different forms. You said to show you where self defense is in the bible. Passages have been given to you over and over again.
Also...
Seatbelts are forms of self defense, You are protecting yourself from potential death in the event you are in an accident. Along with airbags.
Calling and asking for assistance from the police.
Locking your door at night. If self defense is wrong then why would people lock their door?
There are many other examples of self defense that I could give that potential prevent injury or death, and most if not all people have done these things.
Yet, then a firearm comes into the picture then it is suddenly wrong. As I said before. If my life, or my childs life was threatened then yes, I would shoot.
Show me in the bible where I should let my son be killed without protecting him!