Dhonks, turborickey, and I (and any other teachers I can't think of right now) care about a lot more than deaths. A run of the mill 2 week bout with normal covid already gets students past the halfway point to the number of absences from school that increase the risk of failing a grade. In a year when all of us are going to be trying to make-up lost ground from last year students might be even more sensitive to absences than normal. Delta is affecting younger persons much more harshly than prior variants, so cases are a concern before we even get into the fact that deaths are going back-up, some states hospitals are being overwhelmed again, and more cases is more risk for yet another variant. And the earlier research on Long Covid showed both mild and severe cases were at risk for developing it, so more cases is bad on that front.