The schools are being kept closed for all sorts of reasons that have nothing to do with health. From Yinon Weiss at realclearpolitics.com:
Politicians speak about following the science to set COVID-19 policy, but their decisions are more about political objectives than they are about medical efficacy. Why else did California Gov. Gavin Newsom shut down retail businesses in March when the state had under 300 cases per day but allow them to be open in July when the state clocked in at over 10,000 cases per day?
But as badly as our lockdowns have damaged local businesses, a potentially even bigger problem is created by the physical closure of schools. One of the most important functions of a civil society is to protect and educate its children, and the cancellation of in-person education stands to become one of the most detrimental acts of collateral damage during this pandemic.
California currently expects its 5-year-olds to complete kindergarten exclusively through online distance learning. For this dubious undertaking, the politicians are given passionate political cover. The Los Angeles Teachers Union maintains that “the only people guaranteed to benefit from the premature reopening of schools amidst a rapidly accelerating pandemic are billionaires and the politicians they’ve purchased” — as if billionaires typically send their kids to L.A. public schools. The wealthy will send their children to in-person private schools or hire additional tutors, while most American families will suffer from a widening education gap that could set their kids back years. Worst of all, none of this is medically substantiated.