Turns out America isn't actually that progressive, unfortunately. We have Biden and other such candidates because they are popular because they are moderate.
But I agree with other comments: what's the point of bitching about Biden at this point? The bed is made, lie in it or not it's not going to get any cozier. The time to complain was when the 2016 primaries happened. And people did and it turns out America doesn't agree with this idea. It sucks but that's the hand we're dealt. Complaining about the moderate without recognizing the incredible harm the actual fascist candidate will cause is deliberately campaigning for the fascist.
Oh and if someone pushes for revolution: You first.