Drunks

I'm still not too sure how to deal with people who have had more than enough to drink. One guy had had a fair amount, but still seemed probably okay, and he went to ride his bicycle home though we encouraged him not to. Should we have kicked his ass and said "no you're getting a ride" or something, or just let him go? (if it was a motor vehicle we sure wouldn't have let him go). At the end of the evening, a couple of the other guys were pretty drunk and we didn't just want to let them loose to get rolled wandering around downtown or whatever but it was midnight and they still refused to go home and were heading to another bar so eventually we just had to say screw it and go home. Don't know what to do in those kinds of situations. Hard to tell if people are capable of taking care of themselves or not. They're grown men, let them do what they want, but if they're not thinking or acting like it...