What an absurd argument. A neo-con can and will make the exact argument when defending the relentless bombing of ME countries in "response" to 9/11. Not to mention, any of them will make the same argument about RP supporters at the GOP debates or conventions when they were 'disruptive,' as they can claim they feared for their safety.
You either believe in living peacefully whenever possible (that is, always except in cases of self-defense), or you don't. You don't, fair enough. It's your life.