I've been wondering about this for years. Drinking does seem to be related to the urge to self-destruct. Hang-overs particularly seem a form of self-punishment that drinkers, regardless of how they bemoan them, are hooked on.
But I'm not sure that drinkers have uniquely self-destructive personalities. We choose to self-destruct with alcohol, true, but I've seen so many people self-destruct in other ways that I think it may just be part of the human condition.