But who safeguards the dumb adults that are charged with safeguarding the youth?
But who is going to safeguard the safeguards of those who are safeguarding the ones who are in need of the safeguards? This sounds as silly as asking who polices the police. They do.
First off, where did these mysterious dumb adults come into the discussion? Secondly, every adult I know has a supervisor, even the President. We aren't talking about adults making mistakes, why did you mention them? Since you did, I will explain who supervises/safeguards them.
Themselves, co-workers (safeguards), low level supervisors, mid-level supervisors, high-level supervisors, business policies, drug testing, testing to maintain certifications, laws, those who enforce the law, the justice system, God, and I'm sure I missed a few along the way, but it starts with the individual, which is sort of the point we are making here. Young people are not ready for that, so their parents do it for them. I'm sure you can find the exception to the rule, as there always is one, but that also isn't what this discussion is about.
I don't see the logic in your question.