The report I read said that it wasn't just students but a mix of ages and backgrounds. Yes, some students but by no means over represented in the mix.
We can't just blame students for it all. Just reading MN tells us people from all over don't follow the rules.
She and her boyfriend visited Liverpool in the summer and they came home commenting on the fact that they'd not been anywhere else with so many people, young and old in the same numbers, not,wearing masks and not SDing. She was surprised, and that was before students returned.
Not all students are out partying and ignoring all rules - she's at university half an hour away from Liverpool though currently home as everything's online at present and, as I tested positive today (after being super careful and following the rules) she is now SI here through no fault of her own. Her friends flatmate tested positive after spending a week in hospital. She returned and passed it on to two other flat mates - again not caused by parties.
Yes, students moving hundreds of miles across the country to move in, in their thousands, with strangers in big blocks of flats have raised cases. Of course it has. That was always going to happen. It doesn't mean they've all partied hard to catch it. If you'd moved that many people in that way then regardless of age it would have happened.