The following steps should be adhered to in the event of happening upon a peace rally, where you will undoubtedly come face-to-face with a naive, hemp-shirt-wearing, misguided idiot.1) Approach the naive, hemp-shirt-wearing, misguided idiot while he's talking about peace and claiming that there should be no retaliation.
2) Engage in brief conversation, asking if military force is appropriate.
3) When he says, "No." ask, "Why not?"
4) Wait until he says something to the effect of, "Because that would just cause more innocent deaths which would be awful and we should not cause more violence."
5) While he's in mid-sentence, punch him in the face. Hard.
6) When he gets up to punch you back, point out that it would be contrary to his values to strike you (because that would be awful and he should not cause more violence).
7) Wait until he cools off and agrees, realizing that he has pledged not to commit additional violence.
8) Punch him in the face again, even harder this time.
9) Repeat steps 5 through 8 until he understands that sometimes it is necessary to punch back.
Donster 
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"Its a dog eat dog world out there, and I'm wearing Milkbone underwear!"