Many leftists have directed some deeply disturbing rhetoric at conservatives and Trump supporters in recent months, claiming President Trump’s bombast is responsible for the political polarization of today’s America. This is pure nonsense.Sure, Trump talks about MS-13 as “animals,” Antifa as “thugs,” and Hillary Clinton as crooked enough to “be in jail.” His supporters know his presentation to be a bombastic and theatrical schtick, but he never threatens any group of voters.By contrast, some ominous tones, even homicidal and terrorist tones, are coming from the mainstream left. Increasingly, through mainstream media and Big Tech, high-profile leftists are speaking openly...