1. When a person says a retaliatory military force is not appropriate, ask "why not?"
2. He will say something along the lines of " it will just cause more innocent deaths, which would be awful and we should not cause more violence."
3.When he is in mid-sentence, punch him, HARD.
4.When he gets back up to punch you, point out that it would be a mistake and contrary to his values to strike you. It would be awful and he should not cause more violence.
5. When he has agreed and pledged not to commit additional violence, punch him again, HARDER.
6.Repeat steps 4 and 5. Sooner or later he will understand that sometimes it is necessary to punch back.