Nice to hear Utah being progressive. it's outrageous that it was even a thing that police could (and did) take kids away from their parents because they were playing or walking home by themselves.
People against it say "it puts kids at risk", that's the point! So kids learn to identify risks, avoid them, and deal with anything that happens like a playground injury. this kind of experience helps them grow up into more sensible adults, less likely to get themselves into trouble than kids who've never had to think for themselves because a parent is always hoving around telling them what not to do.