True, but thats a % of a % of a % (ie Masks could prevent some % of COVID transmission at school, of some % of which would have be transmitted to other individu

True, but thats a % of a % of a % (ie Masks could prevent some % of COVID transmission at school, of some % of which would have be transmitted to other individuals in the home, of which some % of which would have required hospitalization), which makes it seem likely to be a high cost for not much reward.