>Back on the harms side again, there's a possibility that teaching kids "just do this and don't ask questions" can have negative consequences.
Don't worry. The schools teach that with or without masks.
I wonder if there has been research that attempts to answer the question of whether masks encourage less safe or more safe behaviour - it feels to me like something that would respond well to a well designed study.
Anecdotally speaking, in my corner of England social distancing went out of the window shortly after masks were mandated in shops.
A counter-argument says that wearing a physical thing can act as a constant reminder of covid, causing people to act more responsibly.
Back on the harms side again, there's a possibility that teaching kids "just do this and don't ask questions" can have negative consequences. Again, the counter argument of letting them ask questions and carefully explaining what we do and don't know can be a positive.