Stigmatization
I would bet my house that more than one person who has read this thread has wondered how long their luck will last, or think they have had a lucky escape. Not a huge amount, but more than one.
There is a huge stigma attached to problem drinking, not helped by the huge industry which "treats" alcoholism and has a vested interest in keeping it high profile as a "disease" which needs specialized treatment.
It would help if the person worried about their drinking realized that it is not a reflection on their personal strength if they find it hard to refuse the last drink or feel a compulsion to take the party back to their room, even thought they have commitments the next morning.
Having a drink problem is not the same as being an alcoholic (though the treatment is the same- abstinence).The majority of people who are having problems with their drinking can return to enjoying a drink, as long as they have a period of abstinence which is long enough for them to learn why they are drinking to excess right now, and to know that there is an alternative.
We don't have to wait until the axe falls.