The thing is the older scouts influence the younger ones. So if a 17 or 18 year old scout decides he is “gay” but he is not a scout master, that could still cause horrendous problems.
You are right about that. That is why parental involvement needs to be mandatory. I guarantee you that if one of our Scouts came onto another scout and there was proof, he would be out of the troop.... of course, we are a home school troop and we tend to have a lot more responsible kids and parents.