Huh, my kids went back to school in September of 2020 here in Vancouver British Columbia. There was a short shutdown later in the fall, then schools were open for the duration.

No teachers died, and there was very little in school transmission. Our provincial health officer in charge made the choice based on the data available. BC has a very low overall COVID death rate compared to other jurisdictions. You can go look up the data on deaths and satisfy yourself that closing schools as long as many jurisdictions did was a stupid idea. The idea that we didn't know that at the time is also suspect, since data driven decision makers like the one in BC opened schools back up once the risk of transmission between children was determined.