I hate it when most student-athletes (blacks especially) just spend 1-2 years in college and jump straight to the pros. Education seems to no longer play an important role for the student-athlete, and only a handful of coaches (like Bob Knight, Tom Izzo, Roy Williams) 100% stress it's importance. The problem lies with as usual, the money and fame thing. Most NBA teams want to enjoy a particular player for a very long time (17-18 years), meaning most players have to be 19-20 years old by draft day. The 22-23 year olds (those who spent the whole 4-year college journey) are given little hype and priority.
The NBA and it's DWF's want YOUNG players (blacks especially). It's quite true that most white athletes tend to mature a bit later, compared to black athletes. Hence, the reason why most whites stay 3-4 years in college. Also for most whites (and Asians), Academic Education is just as important as the sporting goal. Most blacks think of only the money and fame.