President Biden, during his latest rambling, incoherent, bad-tempered and often excruciatingly awkward TV interview, was very clear about one thing regarding Donald Trump’s shooting: Don’t blame me, pal! In fact, he looked indignant that the interviewer, NBC’s Lester Holt, would even suggest such a terrible thing. It was extraordinarily insightful to watch Biden working so hard to deflect any attention to his own culpability in raising the political temperature to such scarily dangerous levels that someone would try to assassinate his rival four months before the election. When asked for his first reaction to the shooting, Biden instantly went on...