They try. I knew that when they failed to keep out predators, that this sort of thing would happen. They are damned if they do, and damned if they don’t. If they exclude avowed homosexual leaders, they are discriminatory, if they permit homosexual leaders, and a mollestation occurs, they they are accused of turning a blind eye to sexual predation.
When I was at camp, an older boy from another troop tried to molest me once, right in front of a bunch of members of my troop who were friends of mine. I ignored and then ridiculed him. The rest of the week, we all called him “Jack.” You can imagine why. He never bothered any of us again.