Nothing to do with street design - most suburbs have a park a safe walk near any house. That kids are not walking there is nothing to do with street design.
Some state legislatures are pushing back against this. Utah passed a law in 2018 which amends the definition of neglect to exclude this kind of thing.
https://le.utah.gov/~2018/bills/static/SB0065.html
(c) "Neglect" does not include:
[...]
(iv) permitting a child, whose basic needs are met and who is of sufficient age and maturity to avoid harm or unreasonable risk of harm, to engage in independent activities, including:
[...]
(B) traveling to and from nearby commercial or recreational facilities;
A handful of other states have followed suit. This page shows a map of states with similar laws: https://letgrow.org/states/In short the original post was subtly but very opposed to those very laws you are looking at.
Mind you there is nothing about OS level age verification that stops any of the above - which is why I'm against it.
But now I wonder: I doubt the law would actually consider that you let your kids outside and thereby gave them access to the unsecured device they found in a dumpster. From what I understand of the CA law, you would not be the "operating system provider" in that context, because you do not develop, license, nor control the operating system. I think, at that point, a prosecutor would probably be looking at neglect (if they really want to go after the parent) as the most viable charge, which would be protected by the independent kid laws.
Still, to your point, that doesn't mean the OS law in question will be effective at what it's meant to do, so I similarly do not see a reason to support it. (One could assume "what it's meant to do" is remove liability from social media service providers, but that's not the ostensible reason even if it is the likely reason; regardless, I also wouldn't necessarily see that as a reason to support it.)
there's a general issue with rise in protectionism
However, the ending though, really feels like they're one step away from anti-vax, anti-education, and pro-hate pro-bigotry.
This case really feels like an over-reach. But to condemn the entire system because they have an interest in making sure the country functions and sets minimum standards of life and care is not a "bad thing". The government represents the collective decision-making of millions, hundreds-of-millions of people.
Don't throw the baby out with the bath water because one cop (in rural Georgia of all places) over-reacted.