https://covid.cdc.gov/covid-data-tracker/#demographics
If you want to stick to deaths, we have by age
Under 5: 183
5-11: 119
12-15: 152
16-17: 125
That's a total of 579 deaths among kids 17 or less in spite of the fact that schools and most activities were closed. We don't know what the total death count would have been with everything open, but 579 child deaths used to be considered a lot, and it would have been a lot higher without the precautions that were taken.
Schools stayed open in half of the US and many other countries, and they didn't have noticeably worse results.
579 child deaths used to be considered a lot
Bluntly, it's not. There were over 20,000 childhood deaths in 2016 (https://www.nejm.org/doi/full/10.1056/nejmsr1804754). That level of risk doesn't remotely justify shutting down schools and massively disrupting their lives.
There's also a slight problem of overcounting covid deaths in the US, so a few of those kids actually died of car accidents, and then tested positive for the virus, so into the pile of covid deaths they went...
The actual risk of death from covid for a healthy child is 1:1000000. There are so many things in life that are much riskier than that, and yet many places closed schools over such a tiny risk. It's absolute insanity.
Recounts already happened like a year ago due to this specific criticism, revised down for miscounts and further resulting in a greater total due to missed ones. This is such an old argument that never got updated, just added to the pile of frustrations that never get revisited.
The other issue with this argument is that the numbers are for indicative seriousness, and all other diseases especially respiratory illnesses have the same counting flaws, which means for relative seriousness everyone is still getting an accurate signal, compared to other ailments.
Can we have a sane debate about the drawbacks of lockdowns and school closures? Weigh the pros and cons? Estimate the cost of each option?
Nope! Hysteria it is, and if you disagree you're a grandma-killing science-hating Trumper.