I think people should be allowed to choose as long as they're well aware of the risks.
That doesn't change the fact that he was purposely growing illegal drugs for either personal use or for profit, which makes him either a drug addict or a drug dealer.
Both are illegal in his state.
If he had moved to a state where it was legal I'd agree with you but he didn't, and continued to do it in a state where it was illegal and did not care.
Gays who want to marry will often move to a state where it is legal and get married there. Same deal. If they actively try to break the law by say forcing someone to marry them and falsify documents in a state where gay marriage is illegal and they know it that makes them stupid and ignorant too.