schools don't make money for the economy
people without children don't give a stuff about them being educated
They do, and they should. The children we're educating now are the ones that will help the economy grown in the future, and pay the taxes to support those who do not have children. In a world where someone living in China can do your job as well as you can, you can bet your bottom dollar that if our children fall behind, there will be millions from other countries ready to step in.
WHO reports that schools do not seem to play a significant feature in transmission (although data is limited). However, isn't it also clear that some situations are worth the risk of increased transmission if the service provided is vital, so it becomes a debate of whether you consider education to be vital or optional.
The other factor to consider is that it has been possible to socialise and eat out (or drink out) outside for most of the last 4 months, so perhaps coming indoors is a bigger factor than schools. (Which may explain why places like California and Florida have higher infection rates than northern states, as they're so damn hot in the summer, residents spend most of their time inside).
The final factor to consider is that, because of the schools' policy on testing (any cough or temp requires a test, and a positive case will probably lead to a further 30 people getting tests) means that they're picking up many more cases than we were in July. I didn't take my kids' temperatures once from March to August, so maybe they've had it, but because their cases were so mild, it wouldn't have picked up. There isn't a chance of that now - if they have it, they're almost certainly going to get "caught" in the testing.