True. In 2016 a lot of people voted for Trump just as an anti-Hillary. I think deep down they knew what kind of person he was, but thought maybe that would be tempered somewhat if he became president. Instead, he is worse than anyone could possibly imagine, even disregarding the terrible handling of the pandemic.
OTOH, a significant number of people still think he is a wonderful president (my son, who I dont think is a racist, and is not unintelligent, thinks, seriously, he is the best President ever), and he has strong support from the evangelicals, gun nuts, and those who believe the "fake news" claims of any criticism of Trump.
The Dems have no room to become complacent, have to remain united, and must attack Trump relentlessly on his record and failed promises.
Edit: I particularly liked Sanders' comments at the convention, in regards to the most important thing being to unite and defeat Trump, then to work out differences among the various wings of the party.