Most professional historians would bury negative info on Obama as they have on MLK.
I understand what you are saying, but.
If you want to be famous who’s that that blew up JFK and the girls in the WH pool. I think, depending on the times, there are many trusted biographers. Off topic, It is very hard to be an historian. There is not much but the written record of history to go on. If you asked an Egyptian in 100 bc “What are you?” he would say I am a Roman. Someone with integrity will record the truth. We will all be memories of our families.