So, no actual proof? And actually no, at least where I live, for the first two weeks masks were strongly discouraged and were said to be useless by our local government (Quebec). That was for the first 2 weeks of the pandemic, which were the most important in terms of spread. Even hospital staff were told to not wear them. I'm glad YouTube didn't ban anyone who didn't agree with our local government's opinion on masks then.

Also, that's funny since again, here in Quebec and in most of the world kids were back to school by autumn 2020. Yet it took more than a year after that for children in the US to go back to school. I guess American experts just knew more than everyone else. It's as if things aren't as cut and dry as you make them out to be.