They've not tried to hide behind anything. I've not seen anything from them saying that it was D&E's decision. However the reality from my previous experience is the they will have been given a warning about it if not an ultimatum. And who could blame them?
It's a crappy situation and it's not a one off there were complaints and issues when I was involved over 2 years ago, most of which are dealt with at the time and we move on. You have to remember that everyone who runs and is a convener on every bus is doing so voluntarily and the pay for their seat like everyone else. They're not there to deal with people's behaviour, damage, complaints from drivers and bus companies, questions from the club/police, clearing up rubbish all over the place, vomit, missing games from taking drunk teens to A&E.
I love the craic the lads bring and it's sad that it's come to this, I can only assume that they felt there was no other choice.
Perhaps you could look into running a bus for the 30 excuded lads, you clearly feel strongly about it and there's obviously a demand.
Out of interest what do you suggest they should have done differently?