I don't see that likely tho more responsible separation of fans or alcohol search/bans o match days would encourage milkier, waterier even fruitier fraternisation I've drunk with many English and Dutch lads and oddly after a few they talk as much dribble and behave as stupidly as I and anyone under the affluence of incohol.
Sports in USA for all their financial drawbacks seem less booze fuelled at the venue, folks can sup at home or with other fans in Sports bars.
The issue is despite 60.000 generations young men soon get tribal whn the beer goggles are on and atracted to all sorts from impulse boys to suasage schmugglin'