The shooting at Saturday’s White House Correspondents’ Dinner at the Washington Hilton was at least the fifth known attempt to kill President Trump since 2016 and the third in the past 21 months. Of course, these are not the only acts of violence committed by unhinged leftists, which have multiple sources of motivation. There is violence by Marxists and socialists, by haters of Judeo-Christian civilization, by transgender lunatics, by radical Islamists and by members of the radicalized base of the Democrat Party. Some of these motivations overlap. But they account for the vast majority of the political violence in America—from attacks on synagogues and Christian schools to the assassination of corporate CEOs and ambushes against law enforcement officers.