if the virus in the community is that too high of a positivity rate and/or spreading too fast to safely have school as normal. As pointed out elsewhere you can’t create social distance in a classroom of 35 kids. But maybe you can with 15. And maybe you prioritize the poor kids without internet for the in class experience and if room rotate the others.

There are some ways of providing some level of protection to higher risk teachers, administrators, bus drivers, cafeteria workers etc. But if the virus is spreading in the community it will be spread by kids coming into contact with each other at school. Just because younger kids seem to have lower rates of transmission does it make it zero and if enough kids have the virus it’s going to permeate into the community worse