Biden could be the worse president in history (somehow) and it would be totally irrelevant to whether Trump committed crimes in the period before Biden was inaugurated. So I'm going to spend 0 time on any of that.
Buried in there (conveniently) you argue that the evidence was hearsay. You don't find it remotely curious that none of the people claiming all this testimony is false are willing to do so under oath? We're supposed to believe their tweets and statements on various news shows as truth, now?
If everything the committee is saying is made up, that's going to come up in any case against Trump, and he will prevail in the courts. But even cursory engagement with the evidence presented makes it clear that there's no doubt at all about what he did and said in pretty much every instance. In the case of the Raffenspurger call, there's a recording of the damn thing. In the case of the various White House meetings, the members in those meetings are on record, and there are contemporaneous notes from multiple participants which line up.
None of this is hearsay. Nor is it hearsay that Bill Barr and a bunch of other officials told Trump in no unequivocal terms that his claims of fraud were bullshit. It's them reporting their own words to him, that isn't hearsay, that's just what they said.
If you're under the assumption that any prosecution of Trump would be to prevent him winning, you gotta explain why every Republican alive today is hoping he won't declare his candidacy before the 2022 midterms. Is Biden unpopular? Sure. What's the one thing that will make victory for him very easy to envision? Having Trump on the ballot in 2024.
If anything, I'd say Merrick Garland's slow walking this prosecution is what threatens to appear to be a political decision. Keeping Trump on the ballot is the Democrats best strategy for winning 2024.
Thankfully, they seem to be getting aware, for the most part, that not prosecuting with this much evidence harms everyone much more, and not just in one election.