Logic behind masks being required for anyone under 11 years old?

When literally everyone else in the stadium and within a 3 miles radius of the stadium is virtually already vaccinated? Super bizarre and likely completely unenforceable. Is a security guy going to walk between rows checking IDs of 7 year old children?

Also, I fully expect JBE to enforce a mask mandate for everyone regardless of vaccine status before the first home game. He’s halfway there, and you know he wants to do it.