I've known entirely too many alcoholics that have had too many wake-up and come-to-Jesus moments, only to go back to drinking as soon as the immediate crisis is over. Change only comes when the alcoholic wants to change for their own reasons, not due to external factors.
Livers are a limited resource. Wasting a donor's liver on a person that ~~us~~ is unlikely to stop drinking--despite their protestations--means that another person doesn't get one. It may seem like a cruel calculus, but it's the only reasonable way to ration a scarce resource. It doesn't matter if alcoholism is a disease, or you think that it's a moral failing; the end result is the same.