Some of us are old enough to remember the days before, when stories would be told about someone having a skinful and driving a car home from the golf club only for the car to end up in a bunker near the club gates and the drunk slept the night there.
And some of us know members who, even today, will have at least have 5-7 pints and drive home. One of them does it every day, even though he's been banned twice. Limits won't stop the die hard drinkers, but more severe punishments might.