Are you saying you don't understand that part of his probation was that he wasn't supposed to drink? That isn't an NFL sanction that is a sanction put on him by a judge. He was told by the league that if he broke any part of that probation, which included being out drinking, then he could be suspended.
The fact is if he'd been out drinking, as he probably normally does and many others do, and didn't have any incidents, even minor ones, then the fact that he was out drinking would have been over looked, as they apparently already were from the reports that it wasn't the first time he was out and about having a good time.
The difference between those times, and this one, is that he got involved in an minor incident that had the police called. Now he's in trouble cause he got himself into a situation that could have EASILY been avoided in a number of ways.
He could have stayed at home, as many who are on probation do to avoid getting into trouble. It's not a difficult concept, except for the ignorant who want to try and make everything someone elses fault instead of the responsibility of the individual.
He could have simply walked away when the playful joking, harrassing, whatever it was started to get out of hand instead of continuing with it to the point that someone called the cops.
Again the guy is only in trouble because he's a grade A screw up who had no room, at all, to bring any negative attention to himself, no matter how minor, because of all the times he's already screwed up during his career.
This really isn't difficult. You screw up numerous times and you put yourself on a very short leash AND you have no one to blame but yourself when it happens.
The sooner he grows up, reconizes that fact, the sooner the guy can stop getting himself into trouble and continue playing football.
For his sake hopefully he hasn't burned every chance he had before learning that lesson.