There is also an even more fundamental principle when examining evidence. The explanation has to fit the facts. Childhood success led quickly to adult failure. Corey didn't learn lessons about adversity that are routine to the rest of us. Fame and fortune didn't mean strength of character, but rather, masked weakness and stupidity.
Drugs are fun.
As a famous person, he could get almost always get away with it, so he got careless and got caught. If you can't do the time, don't do the crime. This convict rubric means nothing to someone whose success came so early and so easily. And drugs are really, really fun. So he kept on chipping.