I think it has less to do with race, and more to do with the culture of the upbringing of "stars" in the sport at a young age.
If you are a god on the football field (this is especially true in the south) you get anything you want, all the girls, free side amenities, coaches who fight like hell with teachers to keep you eligible, including in some cases fabrication of grades/school work to keep them on the field. Toss in the fact that everyone is telling them they are the best thing ever, and giving them every chance in the book to get it right. The more talented/special they are, the more freebie mistake/wrist slaps they get. This only gets more prevalent the higher up you go. Just think about this, a HS recruit that's only a 2 star probably has 5000 twitter followers from schools fans that are trying to recruit him. Just for giggles I wonder what a kid like Davante Davis has as far as twitter followers now that he is a top level SEC recruit. That's just an example of the ego inflation these kids get. Now imagine you are a kid getting a side salary on the DL, and have benefactors giving you cash for being a guy on the roster and bonuses for dominating on the field. How could you not think you can do whatever you want and get away without without any issues?
In comparison, The best baseball player in a high school may not even be recognized as special ata local party. How many twitter followers do you think Texas baseball recruits are getting? I'd wager a whole lot less than a kid being recruited by Tulane in football.
Then factor in how many "mistakes" are covered up / kept in house in college football programs over the years you have to believe that these guys feel invincible. But when they get to the big leagues with professional media hounds swarming everywhere and are absolutely desperate for the next big take down story, it's very very hard to cover up an incident in general, and almost impossible to cover one up that's been videotaped. The scrutiny is very real, and these kids who have done whatever they wanted their whole life don't know how not to do whatever they want whenever they want to .
As to the guy talking about playmakers, you are damn right. There is a whole lot more reality in that show than people wanted to realize/admit at the time.
Same with necessary roughness on USA, but that show focused mostly on social issues. But was it a coincidence that it revealed an agency wide PED scandal and then magically was unexpectedly canceled? I don't know...