Over the span of less than one week, America witnessed yet another allegedly left-wing assassination attempt play out at the White House Correspondents’ Association dinner — and also discovered that some of the ugliest recent manifestations of right-wing extremism and bigotry in the United States have allegedly been partially subsidized, for years and to the tune of millions of dollars, by the left-wing Southern Poverty Law Center. (Illustration by Dean MacAdam for The Washington Examiner) It’s a new and unsettling moment, in a string of far too many such moments. It feels inescapably clear that we have a political hatred epidemic in our country, which is too frequently spilling over into political violence. We would do well to tamp down the former phenomenon, and we must stamp out the latter. It is true that myopic, consuming ideological and political tribalism exists on both sides. Curing, or at least mitigating, this crisis is a shared project. It is also an accurate reflection of reality to state that acts of political violence, and tribal support for such acts, are currently a more acute, urgent, and metastasized issue on the political Left. This does not hold the Right blameless, of course, but it does spotlight an uncomfortable truth that many on the Left refuse to seriously grapple with — let alone accept as truth, and strive to repair. The facts tell the story. Below is a review of documented examples of high-profile,...