It's not hard: you stop them from killing you or your family or friends. If that means you have to kill them, so be it.

Jesus didn't condemn the Centurion who had assuredly killed before in order to become a centurion, and was praised as having great faith.

We are counted abd brothers and sisters of Christ, The King, and as such, we are to wage war on our enemies as is befitting ones who rule with Christ.

That does not mean just to pray at people. Sometimes it means to end them if they are doing evil. Sometimes that is the only way for us to stop them. That may be something you disagree with, but, at one said and will say again: I will not be made a victim if I have the means and ability to defend myself and my loved ones, and yeah, we're supposed to love everyone, but... Ebbed Jesus had his favorite disciple, so that just means it's a matter of degree, not kind.