Surely its a given that students will infect each other given the combination of living in close quarters and lack of social distancing amongst that age group - my DD is one, no-one at all is SD in any of her widespread friendship groups in different parts of the country. Nor I might add are any of the members of the two sixth form colleges near where I live. they have clearly all agreed not to SD and hang around in large groups (40+) chatting in-between lessons. This is London so the police are nowhere to be seen.
However, these students are not getting badly ill and many show no symptoms at all. Surely better to let them get it and not panic (because the cat is out of the bag anyway). Sure they may not be immune forever but they will probably have decent immunity this year and some immunity going forward.
I wholly support moving to online only teaching for everyone 11 and above BTW. If I at 60ish can work perfectly well on Teams so can the screens generation.
Now we just need to recognise the the same is happening in schools but with even more asymptomatic cases (I also have a school age DC). Again it's not necessarily a bad thing in population terms, but the people like me (old, fat, diabetic, high cholesterol) are going to have to be even more conscientious about hygiene at home and SD when out. And a lot more testing is needed so we can check who has had it and who has not
.
Even if you live with someone it is not impossible to avoid catching their virus. My DD was sent home from uni with mumps last year (she is vaccinated but anecdotally lots of vaccinated students have been getting it the last few years and there was certainly a cluster at her uni).
Mumps is highly contagious. I drove her home from uni then we stuck her in her bedroom with her own bathroom and used the same measures as are recommended for CV19. None of the rest of us caught it, slightly to my amazement, which gives me hope. Equally the years when some of us have had norovirus, also widely contagious, not all of us have had it.