Have you ever tried to argue with a young child who really wants just one cookie before dinner?
They promise they'll eat all their vegetables, and clean their room, and John's parents let him have as many cookies as he likes, and you don't love him anymore, and didn't you notice how he set the table "without being asked," and who made you the boss of cookies, etc, etc.
That's the emotional/intelligence level of an argument about alcohol with an alcoholic.