"Is getting a substantial chunk of the population exposed, who are generally of low risk, and sequestered away from grandad generally, a bad thing?"
Well, it's very hard on those young students, many of them just 18 and maybe their first time away from home
It would be different if they volunteered to take the risk and "take one for the team", but they didn't
and now they are locked up and many will be nervous, some frightened
The risk of serious harm from Covid at their age is v low, but we shouldn't be blase about that
- a few students in the USA have died and a larger number have suffered longterm symptoms
So if we also get many thousands of students infected, that is to be expected in the UK too
btw, from a current thread, sounds like many parents will be collecting their kid, whatever the rules, so it will spread