Why would Biden want to detail Trump's campaign? Trump is the ONLY Republican Biden can beat
My guess is the establishment wing of both parties doesn't want to take the slim chance of Trump getting back into office. He attacked their media, their intelligence agencies, and revealed their secrets like the fact we go to war with Middle Eastern countries to steal their oil. On top of being a blabbermouth, Trump's foreign policy is all over the place. One minute he's quite bellicose, and the next he's talking about withdrawal. The establishment wants a president they can easily control, and Trump's too much of a wild card.
I think the Democrats learned to not underestimate Trump after 2016. They thought he was the easiest Republican to beat then too, hence their "pied piper" strategy. That failed, so now they're taking the opposite approach. Biden made it clear back in November that Trump would be dealt with if he ran in 2024. Biden told a reporter "We just have to demonstrate that he will not take power if he does run by making sure, under the legitimate efforts of our Constitution, he does not become the next president again."
Until now, presidents had carte blanche to commit heinous crimes with impunity. It seems obvious to me why Trump is being treated differently, even if the charges are legit.