I'm very skeptical that schools are quite safe.
See https://twitter.com/dgurdasani1/status/1346362159446577154
Some key quotes:
Here is a study carried out across >200 countries that showed that among all interventions studied, closing educational institutions was the 2nd most effective. Importantly, the impact on R was similar for pre-school, primary & secondary school settings.
https://www.nature.com/articles/s41562-020-01009-0
Another study of >131 countries showed that among different interventions studied, one of the highest changes in R (R ratio) between introducing an intervention & lifting it was for school closures:
https://www.thelancet.com/journals/laninf/article/PIIS1473-3...
There are more good quotes and citations in that thread, it's worth a read.
Anecdotally, the amount of times I've been sick since my daughter enrolled in public school has been mind-blowing. The notion that kids are somehow impervious to contracting this, or don't bring it home to vulnerable family members, would mean this virus behaves very differently from all the other upper respiratory diseases commonly seen out there. That's certainly possible, but based on what I've observed -- for example, I'm 99% certain the coronavirus vector that got me was a child -- it just doesn't pass the smell test with me.
(Edit: Moved this from downthread)