>Edit: Please with the “but kids bring Covid home” hysteria. We have vaccines now.
Vaccination greatly reduces the risk of severe covid and death, but it doesn't eliminate it. I know people who despite full vaccination contracted covid and are now fighting with long covid symptoms, to the point where they are unable to work for months (but chances are they would be a lot worse off if they hadn't been vaccinated). In a society such as the US with very limited social safety there is a serious risk of loss of job due to the inability to work thanks to long covid or bankruptcy thanks to the inability to pay medical bills. Kids contracting covid in school (or anywhere else) and passing it to their parents may well result in the family becoming a lot poorer or even homeless in the extreme.
Immediate covid risks aren't just limited to death either. Covid is known to cause issues with blood clotting, which can result in all kinds of things like permanent brain damage, permanent heart damage or amputations of limbs. Severe covid is also treated with severe medications and procedures, like steroids which can cause permanent (partial) blindness, ECMO which causes loss of (some) mobility in the legs far more often than not. Just regular ventilation isn't free of side effects either, in particular because of the drugs to sedate such patients. Survivors of severe covid experience PTSD and/or suicidal thoughts at very high rates.
Immediate death and other immediate primary or secondary effects aren't the only risk to covid. Long covid is a thing. Other long term effects due to covid infections are not only possible, but according to preliminary results seem likely, even after covid infections with only mild symptoms or in asymptomatic cases. This includes damage to organs, in particular the lungs, the brain, the heart and the kidneys, which may well significantly lower the life expectancy and (later life) quality of life of people affected by it, be it the kids or their parents, family or teachers.
Looking only at the immediate fatality rate in kids is dangerously shortsighted and missing most of the picture. Pointing to vaccines like they are magic isn't exactly helpful either, as they are risk reduction at best, not risk avoidance.