"I would do anything to protect my family from harm. Don't you care about your family?"
I had a similar conversation with an "Anti" and his girlfriend at an outdoor concert. He stated that he could never, under any circumstances, willingly take another human life. I asked him, "What if your girlfriend here was being beaten and brutally raped; would you kill her attacker?" He said that he would try to "subdue" him but not kill him.
I laughed right in his face and said to his girlfriend, "Remember this moment when you are walking with your boyfriend down a dark, deserted street." The look of disgust she gave him was priceless! I'll bet their relationship didn't survive the evening.