Using the CDC's own data, the date in the first image below makes it perfectly clear that:
1. the risk that US citizens 0 - 17 years of age will die of COVID is 2 per 100,000 (shown as A, highlighted in yellow below). This rate is with no vaccination.
2. the risk of dying from a fatal car accident is 11.5 per 100,000.
Therefore, an unvaccinated student below the age of 17 is more than five times as likely to die in a car accident, than they are to die of COVID, even after contracting it. I am quite certain that no one has a problem with people riding in a car, even though the risk of death from a car accident is more than five times that of unvaccinated children who contract COVID.
And to show that this comparison of death due to COVID vs. death due to a car accident is reasonable, see the second image below of an abstract (summary) from the European Journal of Epidemiology, where they compared unvaccinated middle aged adult death rate due to COVID to the death rate from a car accident.