The Democrats’ activist base considers Donald Trump fundamentally unfit to hold office. Their impeachment drive is really about this damning judgment, not about any specific act such as withholding Ukrainian aid or wanting to fire Special Counsel Robert Mueller. They say Trump is erratic, narcissistic, self-serving, and unforgivably gauche. He cozies up to dictators and would like to become one himself. Every day, he tramples the presidency’s historic norms. Surely the voters who put him there made a catastrophic error, or, rather, the antiquated Electoral College did. In short, Trump is not just a bad president — the worst in modern history — he is an illegitimate and dangerous one, at home and abroad.