Supermom, pedophiles are all ages and people with tons of experience are pedophiles, too. A background/criminal check will only reveal crimes that have been dealt with in the courts. Lots of prerps get away with molesting children for decades before they're caught, IF they're caught. In addition, more and more employers are not giving "character references" -- but can only (by company policy) disclose dates of employment and titles/duties. There is no way to make sure an employee hasn't already molested a child.
Allowing a teen boy to work as a volunteer and have access to children in the intimacy of a coaching profession, is wrong.
Anyone who is allowed such access should have had time to grow up, make mistakes and lets see how they handle their lives.
Just like a person who is qualified to work in a day care center must be of age and have ECE credits.
The prerequisites for working with children should be much higher.
And the public Pool and park should be held liable if any families do come forward; because it is their ultimate responsibility to make sure they hired people of good repute.
A kid they knew fresh from highschool and was student of theirs sounds a lot more like a favor than actual concern for the safety of their charges. If they cared about the safety of their charges, the requirements for access to children should be stricter.