Hitler's enablers in 1933—yes, we should go there, instantly and often, not to blacken our political opponents but as a reminder that evil happens insidiously, and most often with people on the same side telling each other, Well, he's not so bad, not as bad as they are. We can control him. (Or, on the opposite side, I'd rather have a radical who will make the establishment miserable than a moderate who will make people think it can all be worked out.) Trump is not Hitler. (Though replace "Muslim" with "Jew" in many of Trump's diktats and you will feel a little less complacent.) But the worst sometimes happens. If people of good will fail to act, and soon, it can happen here.