Them going out on the town after performing like shite has been going on since Calderwood's days, at least. My son used to bump into them all the time and most of them were dicks.
I don't think that it's the clubs jurisdiction to tell them NOT to go out and socialise. Normally. I think as part of the discipline and the culture however, the manager should reserve the right to tell them not to go out after a particularly bad performance. They quite obviously don't get any help to deal with how to interact with us natives, which has led to many altercations and problems over the years. Humility and intelligence, these can be taught, although certain retards aren't capable of learning.