Don't forget C: Simple self-preservation. Even before the Results were finally called you had calls to make lists and begin the purges. Then Democrats tried to push that abhorrent voting law. Don't forget trying to stack the courts.
My long view has been that the Democrats sold the Republicans a bill of goods "Yah, we'll have the demented old man in, won't push anything insane, and you'll get rid of Trump. We'll go back to the days of the Uniparty". And in their absolute hatred of Trump, they believed them.
That belief didn't survive week 2 of Biden's reign.
While there is still an anti-Trump current (and hence why Trump hasn't officially announced he's running -yet-.) That wing is being steadily supplanted. The Democrat's worst fear is that 2022 will result in a Republican landslide. The ruling party always loses seats, and there is a -lot- of anger here. And if Republicans gain power, everything the dems need to keep Trump out in 2024 are just -dead-.