This is one of those things laws are great at. Delete the power of idiot Karens and the culture will return to normal.
It works for Utah (and to a point, Texas); it can work for your polity, too.
When children are at far greater risk of abuse and abduction by concern trolls and the State, and they very much are in New World countries, your society is broken.
How? Those idiot Karens are the ones writing the laws. They get on your state legislature and local town ordinances, and prevent more housing from being built too.
They have no competence and they do everything in the name of "safety", so you can't challenge them with logic or reason.
They are usually very privileged people with plenty of time on their hands so you can't play asymmetric warfare with them and expect to win.
Karen delenda est.
Is there evidence of that? And would you define 'concern trolls' (beyond 'people who have concerns different than mine')?
"Trying to abduct my child either directly or by proxy" is not merely a question of polite differing concerns.
We know the concern is insincere because the OP’s example (children playing in their yard) cannot be considered concerning by a reasonable person.
Free range laws say the opposite: that a kid over a certain age is allowed to be alone and the parents CANNOT be charged for it. It’s to encourage free range parenting.