Don Jr was heavily involved in his first term, wasn't he? Elon Musk is a fantastic businessman. The MyPillow (pretty unpopular if I remember, Mike something) guy was very vocal in the first election run but hasn't been heard of at all this time round (well, I've followed it closely and haven't once seen his name crop up). RFK Jr I don't know a whole lot about.
Regarding the whole Democrats painting him as a dictator thing, that was very publicly debunked with him tongue-in-cheek saying he would be on day one only. He wouldn't have the power to put any of his political rivals in prison.
He's been charged with some serious crimes and I can certainly say that quite a few of them deserve to go through the justice system, but I can also confidently say that others should never have seen a court room and it was 100% driven by his opponents in an effort to tarnish him and get him out of the race.
The whole recent Nazi thing was despicable, on the back of two assassination attempts as well. He's literally bought by Israel.
Others have responded to other points you made, so I'll tackle another two.
1) You agree with his serious crimes being investigated, but not others. Do you think the President of the United States should be someone who has all this litigation surrounding him. I'm not even going into the details here, but sounds like these aren't disqualifying. Fair enough
2) The whole Nazi thing is despicable, but apparently not despicable enough to be disqualifying.
3) And I can't help myself here, but there are multiple people from his first Administration - Republicans - that say he's a fascist, a wannabe dictator, wholly unfit for office, or some mix of all three. These aren't Democrats. The Jan 6 witnesses were almost all in his administration and Republicans.
So I really have no idea what your point is