And there is more to the world than Covid. Safer also means the first line of defense for abuse.
Sadly schools are sometimes the only place for nutrition. There is mental well-being, mental health services for many students, special ed services, and then the actual reason schools exist which is to provide the best education possible which is NOT online teaching. One can be put in a bubble to avoid Covid but that doesn't mean they are better off in the big picture.
And don't forget, if you really feel strongly about your safety you never have to walk back into a classroom again.