A common defense of President Trump points to the positive things he has done from a Republican perspective — his appointment of Justice Neil M. Gorsuch and other conservative judges, his pursuit of the Islamic State, his honoring of institutional religious freedom. This argument is not frivolous. What frustrates is the steadfast refusal among most Republicans and conservatives to recognize the costs on the other side of the scale.

Chief among them is Trump’s assault on truth, which takes a now-familiar form. First, assert and maintain a favorable lie. Second, attack and discredit sources of opposition. Third, declare victory based on power or applause. So, Trump claimed that Florida Democratic Rep. Frederica Wilson’s account of his conversation with a Gold Star widow was “totally fabricated.” (Not true.) Wilson, after all, is “wacky.” (Not relevant.) And Trump won the interchange because Wilson is “killing the Democrat Party.” (We’ll see.)