A fair point

"And the terrible irony in Robert Downey Junior being made an emblem of self-destructiveness... is that he, the scapegoat, cannot be made to look like a cautionary tale. He looks like a walking advertisement for drugs. Everyone knows that in the last analysis most drugs are just poison. But there should be a special dispensation for anyone who's really good on them. You'd have to go to court, stoned, and prove that you were actually brilliant company. If you couldn't, you'd go to jail, like Richard Dreyfuss. But if you could you'd get a renewable five-year licence and we'd be allowed to hang out with you, like Hazlitt around Coleridge."
(Madame Depardieu and the Beautiful Strangers, Antonia Quirke)