Muslims should be SHOWING the trailer for that joke film everywhere and then saying "See this is how dumb anti-Islam people are." That movie would better serve as pro-Islam propaganda.
That's exactly what Islamists in the Middle East have been doing. Except, instead of "look how dumb anti-Islam people are," it's: "Look how they offend and desecrate our religious beliefs, and since the West is allowing this sacrilege to exist and letting everyone see it, I think we should go throw rocks at the American Embassy to let them know how we feel about this." It's apparently being used as a recruitment tool by Islamist groups with varying shades of extremism. Huge demonstrations, riots, and assassinations don't just happen out of thin air, y'know.