Don't think. This is exactly the issue with Biblical "gotcha." Don't drink, don't fornicate out of wedlock, treat people well, be kind, eat well, lend help to those less fortunate than yourself, read The Bible, go to church, exercise, don't be greedy, don't accept money you haven't truly earned, work hard, be honest, don't watch porn, don't smoke, pray everyday, accept Jesus Christ as your Savior, and defend yourself and your loved ones against external threats of evil and unjust persecution by unrepentant attackers.
Romans 10 lays out what Christianity is about. It's about belief in the living God and the son that was sent who preached of the living God.
It's a little strange that you're arguing against some rule based pacificism, while arguing for other rules. Following rules for their own sake is not what Christianity is about. Anyone is welcome to explain why I'm wrong.
Therefore, I don't need to ask fellow Christians for permission to defend myself. It's a non-issue.
