Well then here's a meta-analysis from June 2020[1], the time in question vis-vis school closures. A study from 2021 finding that school closures had little effect on community transmission[2]. Here's another from 2020[3]. Here's another from last year showing lower transmission by children[4].

>The numbers they came up with do not even remotely track with what they saw in their own schools.

What the research suggests is that you're probably seeing kids under 12 getting COVID from adults.

You can poke around google scholar and see for yourself. Public health articles are quite readable.

[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7311007/

[2] https://www.sciencedirect.com/science/article/pii/S018844092...

[3] https://www.eurosurveillance.org/content/10.2807/1560-7917.E...

[4] https://onlinelibrary.wiley.com/doi/abs/10.1002/ppul.25344