Why? Masks dont help much. Vaccines dont stop contagion or transmission. They do lower risk of severe covid but kids are very low risk even if unvaccinated.
It depends what kind of mask. Proper respirator masks like N95 and FFP2 work very well. There are now very clear results that show that the main mode of transmission is respiratory aerosol.
I can’t find fault with the data or the investigation or the conclusion – I act according to this: We’re dealing with an airborne pathogen. Aerosolized.
Closed masks – respirator masks – N95/FFP2. These do work. Almost unreasonably well.
“Surgical masks” that gape at the sides do not protect well against aerosolized particles.