The Democrats made a lot of mistakes but I don't think they were so utterly terrible that nobody could vote for them, no. They were an infinitely better option than Trump, in my view, hence me holding those who voted for Trump accountable.
What I'm saying is that, those who felt that the Democrats weren't electable could have chosen to put up a different alternative. Instead, they chose the fascists. You can dress that up in whatever way you like, but the decision was on them.
Left wing administrations have been voted out of government countless times without voters having to resort to fascism. The people who put Trump in a position of power need to own this. History will not judge them kindly.