Firstly, I have had 2 children go through uni and out the other side and I fully understand the emotional and financial aspects.
But
They leave home, expect to be treated as adults (rightly) and have their first taste of independence. After a summer debating the risks of going to uni this year in the middle of a pandemic why are they surprised they have to isolate in their rented accommodation like anyone else? That they have to follow the rules like the rest of the law abiding?
IMO they chose to go, they couldn't have expected normal, so get on with it.