I try.
In all seriousness, there is this perception that OJ is a headcase, mainly based (I'm guessing) on the fact that he was suspended from a game in the playoffs and the fact that he has been tight with Huggins.
There is also a notion that KSU would be better served having a bunch of 3-4 year players rather than the best basketball player since LeBron James for one year.
The first perception is mainly caused by ignorance, stereotyping, or a combination of both.
The second is caused by "yearning for the old school" types, or people that just simply don't realize how good OJ Mayo really is.