I often think the risk factors are being overlooked in this debate.
If you are
a) not of retirement age
b) not in a medically vulnerable group
then your risk of dying of coronavirus is really, really tiny. The younger you are, the less risk. For example >90% deaths are over 60, >99% are over 40, only 0.05% deaths are under 19. It's a disease that kills the elderly and infirm.
The personal risk if you meet (a) and (b) is not in catching coronavirus. You may well, at some point, catch the virus but the point to note is that if you're not old or already with a comobility then the virus is just a virus - not something to kill you.
The risk in getting coronovirus (If not elderly or comorbid) is not dying, its/passing it to someone who is elderly or with a comorbidity - it's a risk to the elderly/infirm
If we continue to shield and isolate those at actual risk of dying, then the rest of the population are not in a situation whereby they might die of coronavirus.
I just thought I'd type this out because, I feel, the actual risk is being lost within this educational debate.
If I was in charge then anyone who is over 70, with a comorbidity, and anyone who lives with these should all be isolating to protect themself. So I would suggest staff and pupils who meet the above should be advised not to work or go to school. But I think everyone else needs to start to better understand the data in terms of their actual risk, instead of perceived risk.