Steele Dossier: This was literally fake Russian disinformation used to slime Trump. It was paid for by his political opponents, seized on by deep state Democrats to weaponize the Dept of Justice against Trump. When caught they sheepishly claimed they were innocently misled. Some Democrats still cling to this hoax, because many of them are just kind of stupid and corrupt that way.
Very Fine People Hoax: Trump said there were fine people taking both sides of the question of whether to remove Confederate monuments. However he specifically said he wasn't calling Neo-nazis or the KKK very fine people, and that they should be condemned totally (his words).
Children in Cages: A frightening number of women and girls who migrate across the border are raped - like literally MOST of them. Children are brought by human traffickers who frequently aren't even their parents, even if they claim to be. When arrested on an illegal border crossing, migrant children must be protected while law enforcement determines what needs to happen next. This is why it was not totally crazy that the OBAMA ADMINISTRATION ran these juvenile migrant facilities back in 2014, which is when the startling pictures of kids sleeping inside boxwire fencing were taken. There are no easy solutions to this problem, which is part of what kind of breaks the heart of Melania Trump (who wants to help the children but isn't sure how) and made her cuss in a deceitfully recorded phone call, causing pedes everywhere to love her even more, if such a thing was possible.
Insurrection Hoax: Donald Trump literally said to peacefully and patriotically make your voices heard in a peaceful march to the Capitol building. So he didn't tell his supporters to trespass into the building. And those who trespassed weren't engaged in insurrection either. The Stop the Steal rally and Peaceful March to the Capitol were to demand a 10 day audit of a very dirty election.
Democrats just lie a lot, especially when they can shamelessly slime political opponents.
Your question is rhetorical, of course, and the obvious answer is that they DON'T accuse Trump of real misdeeds because they CAN'T. They spent $40 million dollars to investigate Trump -- more money that the 9/11 and Challenger investigations combined. When they did that investigation, they said it was about collusion with Russia, but the truth is, they would have been happy to find anything. If they had found any crime that they could hang around Trump's neck, they would have done so. But they found nothing! Compared to any politician in Washington (especially the ones making the accusations), Trump is squeaky clean.