Masking is effective until a person has breathed out enough particles into the room that anyone taking a breath will get enough virus particles into their lungs

Masking is effective until a person has breathed out enough particles into the room that anyone taking a breath will get enough virus particles into their lungs to statistically chance catching the disease. Even with a well-fitting mask, a sick person will saturate a rom with virus particles given enough time. When you account for lousy cloth masks with only 10-20% effectiveness that rapidly drops to effectively zero combined with n95 masks NOT being recommended for children, of course infections would occur. Put them into a little room and in close proximity all day, and we should probably be surprised that the infection rates weren't even higher.