For the person on here whose niece is self-isolating and stuck with someone who appears to be having a mental health crisis- first have they got in touch with the wellbeing services at the university (not just those doing the isolation/food deliveries). They should write emails to their tutors and/or the Students Guild and ask for urgent help for this person. Also, if I were this person's parent, as soon as isolation was over (or sooner if I was genuinely concerned) I would pick them up from uni myself. Sometimes you have to do what's right for you, even if it's not entirely within the rules, Finally- when this idea of staying for Christmas was mooted, and it doesn't look like it's happening, even one of the Scottish ministers said that if the person had mental health issues it wouldn't apply.
If someone is having a mental health crisis, then you can bend the rules (IMO)- just as DC bent the rules when he had a childcare crisis. I think often people are hemming themselves in with rules that may or may not exist and I wouldn't sacrifice someone's mental health for that.
That said- why is everyone calling for online only teaching? Online can be absolutely fab- but internet connections are not great in the UK, we are not covered in fibre-optic broadband like South Korea, the gov't was slow to roll this and it's not great when it has, many people pay for cheap internet and doing Teams/Zoom is just about doable on a good day but not doable on a bad. Online learning requires stable fast broadband, which we haven't quite got in place yet.
Plus as SueEllenMishke says, everyone was adamant, including the gov't, that face to face and back to normal was the way to go in July- they were telling everyone to return to the office for starters! People were outraged at the idea of online university teaching when schools were face to face.
Now, it looks 'obvious' that we should have gone completely online! Although then they are just sitting in their bedrooms, in halls or in parents homes, so I'm not sure that's great for mental health at all.
It's a moveable feast and the universities are trying to catch up. I'm still offering face to face seminars and have chosen to do so, with lots of online content and online seminars for those that can't make it/won't be on campus.
Lots of young people are enjoying being away from home and being a bit independent even if they aren't getting the full experience. If I were a parent, I would encourage them to go even if things aren't perfect, but be prepared to retreat and do what's best for them individually if it is just too much.