If someone hits you, its a trespass. If someone comes in your home, its a trespass. Does Jesus not say forgive trespasses?
Does Jesus not say to his disciples people will try to hurt and kill them? And that they endure and keep forgiving and spreading the word of God?
Does Jesus not say, if someone wants to take something, let them?
Let the sinners sin?
If I partake in killing, to stop a killing, Im sure god will understand. In fact, I'm certain He will. But it doesn't make it the right thing to do by Jesus' commands
I'm sure God could say 'you tried to protect your family', but also could say 'but vengeance was meant to be mine.'