What are the options though?
I'm speaking as a parent to a child in year 13.
Are you expecting an entire year group to have their education compromised in the most important year of their schooling?
Last years "year 13" and "year 11" suffered horribly with regards to cancellation of exams and the stress of the results fiasco.
You want this years cohort of 11/13 to suffer even more badly?
They'll lose out on masses of teaching time and the state sector will suffer in comparison to private schools due to funding of online facilities.
You're talking about sacrificing the future of a huge number of children who aren't at great risk from Covid (but will be expected to finance the nations debt for paying for it) for older generations who arguably have had the benefit of greater opportunities and an economic environment that has allowed them/us to own property and have a lifestyle that I can't possibly see how this generation can replicate.
Of course keeping schools open is a risk, but compared to pubs/gyms/restaurants etc it's absolutely imho a priority.