There's a good documentary about it but I can't remember the name. (Probably something with "Tulsa" and "Riot" in it. Maybe the Cinemax one listed on the wiki page.) But it interviews people, etc. And at one point they're interviewing someone who was part of the attacking blacks, burning down their houses, etc. and why he did it and stuff (this is like 60 years later or more, so he's old) and he's just kinda dumbfounded "I don't know, it's what you did."
I always thought it was dumb to have another 45 minutes or whatever of documentary after it.