I'm sure they do: and they do from the position of being able to talk about the consequences but not actually grok the consequences. You're doing it right here: think of the children! Well sure, but okay what about the teachers, the janitorial staff, the administrative staff? Schools aren't a machine children go into and then with no other inputs, education comes out.
Nobody is forcing teachers, janitors or administrative staff to keep working. If they find the risk personally unsuitable they’re free to find another job. Plenty of other jobs are hiring.