It's almost as if the concern is not the kids individual safety as it is the fact that these kids live with people who would be harmed by this spreading further, are taught by teachers who would be harmed by this spreading further and go around in a society of people who would be harmed by this spreading further.
In your great state of AZ, a teacher just died of Covid.
https://www.abc15.com/news/state/beloved-gila-county-teacher-passes-away-from-covid-19
In our country, at least 25% of people have "co-morbidities"which does not include old people. It's almost as if this is a real danger to a lot people so stopping super spreader incidents might be a good thing.
Kids not being likely do die isn't the point no matter how many times you say it. Until you create a bubble that has only kids in it, putting that many people together is going to kill and seriously injure many others. That may be acceptable to you because you don't see the direct correlation, but it's a fact.