an anarchist
Your local loco.
I emphasize the bolded above.Yes. Big Brother has no business setting vetting standards for private entities. It's up to the private entity set the vetting standards (within the confines of the law, of course) and up to the parent to decide if these vetting standards are safe for their children.
Is that not Big Brother setting vetting standards through laws? When you say “within the confines of the law” are you not saying you agree to the government having some say in the regulation of the vetting of people such as Sunday School teachers?
Edit: for example, presently I don’t think the government would let a church use a registered SO as a children’s teacher. So that is the government enforcing its vetting standard on the church.