I would never fault a person for managing their pain. I Might be inclined to fault a person for refusing medical treatment based on a (imo) false belief, but then I also believe in freedom of choice, so again, Prince is allowed to live his life as he wants and small minded opinions are nothing.
Furthermore, the media is so quick to jump on the latest "crisis" they can't even wait until the body is cold. They're salivating at the fact that opiates were found in his bloodstream but it has yet to be determined what, if any role they played in his death.
