given that I think every one of those drugs should be legalized, with some regulation obviously (minimum age, heavy taxes, awareness campaigns, etc.), the worst thing I can say about this dude aside from the as-yet unverified murder for hire allegations is that he exploited an unregulated market in a way that caused indirect harm to people.
well, we don't give the goldman sachs or bear stearns board life in prison, and they ultimately caused hundreds of times more damage in human cost, so I think we have a bit of a double standard here.
P.S. I should also say that I really hope that the murder allegations are not true. not because I have any great love for this dude, but because it would obfuscate the real issue, namely the fucked up laws regarding drug use and sale in the united states and the consequences therein.