This is exactly why all the people that said "choosing to protect life is also choosing to protect the economy" were right. It sucks, but people with savings can choose to quit over having to risk their lives. So if there is an appreciable risk (and associated hazard, which, for many of our older educators there is) then that is what is going to happen and you still get the disruptions to the economy.
Why are nurses and grocery workers working then? How are they less at risk than teachers?
My wife's a teacher. She was back in school for a day last week, with a much smaller class of children. The first thing one of her children tried to do on seeing her was give her a hug. I doubt this happens to many grocery workers.
In September she'll spend about six hours a day in a poorly ventilated and inadequately sized classroom with 30 children. Neither she nor the children are allowed to wear masks or gloves. From the single days she has been in each week, she's watched children unable to maintain social distancing in the classroom or the playground. They cough, sneeze and wipe their noses on their hands and then touch everything. That's what kids are like.