https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9628515/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9637007/
https://www.frontiersin.org/articles/10.3389/fpsyg.2021.6694...
A pretty uncontroversial view among those who had kids or worked with kids during that time.
Here is a great starting point from 2021. https://brownstone.org/articles/studies-and-articles-on-mask...
They are a failure. Globally. https://www.amazon.com/Unmasked-Global-Failure-COVID-Mandate...
One of the largest peer-reviewed European studies says... "These findings indicate that countries with high levels of mask compliance did not perform better than those with low mask usage." https://www.cureus.com/articles/93826-correlation-between-ma...
Why? Because they are ineffective and were only introduced as a way to busy or "pacify" the masses.
But the difficulty for proving masking helps is: 1. If it only takes ~20 virions to get infected, then masking has to have a basically perfect filtering rate and be worn perfectly 100% of the time, neither of which is obvious. 2. With an endemic virus even if masks slow down spread they aren't going to reduce your likelihood of being infected overall.
> Consistent use of a face mask or respirator in indoor public settings was associated with lower odds of a positive SARS-CoV-2 test result (adjusted odds ratio = 0.44). Use of respirators with higher filtration capacity was associated with the most protection, compared with no mask use.
I'll take a reduced risk, even if it's not perfect. Would you prefer to get covid one time, or five times? It's like arguing "why bother wearing a seatbelt, when it doesn't prevent injuries in accidents?"
Also, are you suggesting masking does not help with preventing influenza infection?