I doubt Richy forced anyone to take drugs; especially kids.
For me, the demand for drugs is more worrying than the supply of them. But because the demand is there and suppliers are limited, there's a lot of money to be made. I think that proved too much for Richy to resist.
I think he's greedy and took the easy option and wouldn't say he's evil.
And if you don't want to buy his round, fair enough, but someone else might want to.