The truth is that groups of football supporters (and also some other groups) travelling together in common cause will enjoy friendly banter and good humour. It's inevitable. The difficulty we're all avoiding too much is that the TOCs know their trains will be busy and in many cases could provide more capacity. If they've no extra stock they know where and when pressure is likely to build. It's fairly predictable. Of course we may genuinely be so short of rolling stock that nothing could be done, yet I'm left wondering.
As one example it seemed odd to have to travel in a single unit 153 shuttle between Wakefield and Huddersfield when it must have been fairly obvious that Leicester City fans would be wanting to see their team collect seemingly easy points. I gather the following train to mine was equally packed. I couldn't see the doors for people when we stopped en route. The lads were polite, good humoured and in excellent voice. At Huddersfield 3 142s were parked out of apparent use.
The other example I gave was of a single 185 that I know TPE want to double up to 6 as soon as stock is released. In that case the doors had been opened before Sheffield, some had got out (possibly not able to see which station they were at due to the crush, or to allow people wanting to leave at Dore get through the train) and were having to push to get back in again. One door in particular then refused to show as locked. The choir on that train was also in good voice (don't know why Owls supporters were chanting Liverpool, Liverpool, but they were) but the train was going nowhere for 8 minutes as people jumped off and back on. 3 BTP were aboard the rear carriage, also jumping off and on to try and resolve the issue. The driver had a green light throughout and other trains now backing up.
In neither case was there any suggestion of hooliganism, although the banging of flat hands on the side of the 153 and fists pounding on the backs of seats in time to the singing was very loud. In both these cases the trains were carrying very full loads. It's a tribute to the majority of fans that there aren't more violent incidents. However the potential is not far away. It must happen many times across the nation almost every Saturday.
The guards have a very difficult job, caught between a rock and a hard place. At Piccadilly there are station staff on 13 and 14 always controlling crowds, familiar with telling people their train is over full, to stand back and they'll have to wait for the next. It's quite often not taken well and leads to angry exchanges that can and does delay trains further. Controlling the doors on a packed and besieged Pacer can't be much fun, especially without such platform back up.
The specific incident that started this thread is not for us to investigate as we can't be aware of everything that was said to who, where, when, why and by whom. Platform back up may have been less than adequate. Dr Beeching advised not to have many spare old coaches. The managers of today are unable to allocate enough of the ones we now have to meet short term and varied peak loads, not least because so many units are incompatible with each other, and there may be no paths or platforms for them to occupy when they are.
Once again we seem to come back to the fact that railways can convey crowds well, but only if they can provide sufficient trains to carry them in. Closely packed crowds, no matter how good humoured, can be very dangerous, in stadia, the street, the station or train. A badly phrased comment, an accidental trip, illness, anything can trigger something to cause a crowd to act irrationally.