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Of course it helps.
The mask helps to prevent an infected young player (*who is showing no symptoms*) from coughing, sneezing, spitting, or simply expelling droplets (talking/shouting) near other people and infecting them, thus spreading the virus.
I agree that it does little to protect the person wearing the mask.
Risk? More risk driving to the rink. Two week report 7/26-8/8 of MA death rate by age group... average age 86. https://www.bostonherald.com/wp-content/uploads/2020/08/WEEKLY-covid-19-dashboard-8-12-2020.pdf
99.97% of the population won't be affected by Covid. Fact.