If gay people were pouring into bars and punching straight people, I as a gay man would speak out. If Jews were propagating terror in the name of our religion, I would condemn it vociferously. And when violence has come from the conservative side, I don't hesitate to stand against it. But it's not. There have been no right-wing groups storming campuses and flinging feces at speakers we don't like; no tea party mobs destroying property, assaulting police officers and paralyzing residents of our major cities; and no Republican Senators calling their colleagues murderers just weeks after a political assassination. From Portland to New Haven to Washington, D.C., the violence we're witnessing is largely a product of the hard left, and the reaction from mainstream liberals – mostly silence, dismissiveness, equivocation – means it will continue to flourish.