It might be an unpopular opinion, but it doesn't make him a monster. His reasoning for it is that he doesn't want to cause more harm.

Sure it doesn’t make him a monster. It isn’t going to make me stop loving his music. But it does make me question his judgement.

He’s an addict, so he needs to avoid things that may trigger his addictive habits. He talks about weed leading to worse drugs. But not everyone is an addict.

I’ve been using weed for like, fifteen years. Have never been tempted to try anything harder. Most people I know who partake are the same way. Making weed illegal because addicts might go on to try harder drugs is ridiculous in a world with alcohol in it.

Reducing other's freedoms because they're bad for you is something I'd consider evil. People should be allowed to make choices for themselves. If you think they're harmful than you should try to educate people, but you shouldn't try to make them having a choice (which you were allowed to make) illegal.