You open with "IMO" but want evidence from me? Lol.

There were many dems who remembered Trump as the funny orange man, didn't really care to turn out against him, and fell for the "both sides bad" messaging that was absolutely rampant on the left (esp with regard to Kamala and Palestine). So no, I don't think the most important rally-the-base rhetoric was to ratchet up "Trump is Fascist" so much as suppress "Both Sides Bad" while we had an election to win.