Of all the tiresome falsehoods from the so-called “resistance,” the narrative that Democrats lose elections because they are just too decent and fair is among the most ridiculous. If only they would put aside their genteel political ways, this self-serving theory goes, and do what is necessary instead of what is civil, they would force the American people to finally see the truth of Donald Trump’s evil. Columnist Juan Williams (who, it should be noted, does have a reputation for civility) is the latest to propagate this assessment of Democrats as being too fair to their opponents in the Trump...