You really can't pin hypocrisy on the Democratic party here. You saw the same with Al Franken (where, in hindsight, they were probably too quick to judge).
Why would anyone protest if Biden has already called for the resignation? "We are demanding that you do what you're already doing!" That would be silly.
[0] https://en.wikipedia.org/wiki/Joe_Biden_2020_presidential_ca...
As for "lots of clamoring for removal", things are moving in the right direction; why make a lot of noise if things are going well? Plus in recent years at least, the Democratic party generally has a history of usually doing the right thing with these kind of issues as far as I know. The Republican party on the other hand has lost the trust that they will just do the right thing, and events from the last several years don't really make that lack of trust all that unreasonable to be honest.
[1]: https://www.newyorker.com/magazine/2019/07/29/the-case-of-al...
