All of his supporters in 2016 were also bad people. They saw the "grab them by the pussy" tape, they saw him make fun of a disabled person, and thought he was still a worthy candidate for their vote.
Whenever I brought this up to my Trump-supporting aunt (who lives in the UK) she would just wave it off and say, "Oh that's fake news." I genuinely think they're incapable of even entertaining those facts, let alone seeing them and supporting them as you say. It's an absurd level of brainwashing.
Oh, I got sick of Trump so quickly that around a year after he got in office I was just catering discussions with "Why would you support a known and admitted rapist?" Doesn't advance the conversation with those fools, but it certainly ends it.