God, people are twits on this thread.
It's not about teachers necessarily getting sick - the data clearly shows that schools drive community transmission, and there are still A LOT of unvaccinated adults out there, and of course the children, who can pass on the virus.
This is still enough to drive up the R rate to increase hospitalisations within the next few months. A proportion of younger, healthy adults needing hospital treatment will still be enough to put undue pressure on the NHS.
Many school staff and parents are rightfully pissed off because the government could have used this lockdown to take measures to make schools safer, and they've done precisely nothing. Other countries, inc. Europe have masks for children over 6. Installing HEPA filters in unventilated spaces is a relatively low cost per child and would really help with aerosol transmission. They could have looked into Nightingale classrooms to spread out the space. Actually, they should have done this last summer when rates were extremely low.
Also, allowing moderate levels of community transmission increases the risk of mutations that can escape from vaccines.
It's been hard for all parents, we know that. But opening schools all at once is a recipe for disaster.