the police would be involved, so they would know that it wasn't your fault. If you drink so much that you are not aware of your surroundings, then you leave yourself open to all sorts of problems. Better to be with friends that can take you home, or one doesn't drink that night.
The people i have known over the years were out and out alcoholics, they could not get by a day, even a few hours without a drink, that is not your average boozer on a friday or saturday night.