You don't represent alcoholics. Personal experience gives you a bias, not a justification for being condescending. Medical decisions are not and should not be based on moral judgements of the patient's behavior.

You're now changing your idea to add "over someone who may need it more", which is different, and I'm not disagreeing with that. It's the same as favoring young or healthy people because they're likely to gain more life extension from a transplant when the rest of their body is working OK.