He was arrested here of a non-violent crime and did his community service for it. Looking at this as a whole, him coming here helps the economy as tour promoters, venues, etc., make money while he isn’t really dangerous to anyone (unless you’re listening to his music IMHO). I say let him in. He has been arrested many times in the past here and in the UK for drug possession, so that’s what’s probably keeping him out.
If he did what he is accused of doing, I'd say he is definitely a danger to teenaged boys and young men.