Why do such promising Athletes do these types of things? It's COMPLETELY baffling to me!

Justin Moss was the player of the year in the Mid-American Conference last season and led UB’s run to its first-ever NCAA Tournament berth.  Now Justin Moss is merely a statistic as he was removed from the UB Basketball Team, and even more devastating, REMOVED FROM THE SCHOOL for his part in stealing money from another student's dorm room! Why?!

Why do prominent athletes do this to themselves?  It just doesn't make sense to me....especially at the professional level, as we see NFL players, etc. doing some of the dumbest things imaginable and losing their jobs.