The CDC has defined safety and risks for schools.... go read.
The complete CDC chart showing safety risk at different levels of COVID community indicators
CDC indicators and thresholds for risk of introduction and transmission of COVID-19 in schools
https://www.cdc.gov/coronavirus/2019-ncov/community/schools-childcare/indicators.html#thresholds
This isn't based on data. It's just their recommendations. There's no data at that site showing any proof that going to school outside of their defined parameters is unsafe. There is no study that shows where mortality increased when we didn't follow their recommendations.
and this is the same CDC that changed its tunes so many times on so many issues. Like I'm supposed to just "take their word".