If the American colonists hadn't done "killing," you probably wouldn't even be in the U.S. - as your ancestors probably came after the U.S. got its freedom from Britain by killing enough Brits. There are some problems that just cannot be solved without violence.
Like abortion?
Violence against abortionists is contrary to Christian law, and any other law.
It is also counterproductive to changing the hearts of those who are pro-choice.
Violence is a fools errand.
No doubt your folks were on the WRONG side in the Pequod War. Now that's one where all the issues are not yet resolved.
BTW, there's a "self defense" exception well recognized in the killing business. If you think it's OK to run around killing your neighbors, they are entitled to defend themselves against you up to and including the point where you are no longer able to attack them. That could include your death although that is sometimes not required. It's part of the reason we don't just execute all POWs at the conclusion of the war.
My point is and remains that it is false to believe that death resolves issues, particularly when the believer is targeting the innocent.
So you believe that liberals should be free to kill members of the US Armed Forces, based on their belief of saving innocent lives?
And did you also defend Kathleen Soliah, aka Sara Olson, the Symbanese Liberation Army mother convicted of planting a bomb beneath the car of a policeman and of killing a [Christian] woman during a bank robbery?