The way parents interpreted the poll is not "Given a hypothetical park somewhere in the world, should..."
But rather "Given the current state of parks in America, should..."
The parents are most likely right, it currently probably is unsafe for kids to be alone in public parks.
But that is not because american parents hold dogmatic beliefs about kid independence, they're just making a judgement call based on how unsafe parks currently are.
The way parents interpreted the poll is not "Given a hypothetical park somewhere in the world, should..."
But rather "Given the current state of parks in America, should..."
The parents are most likely right, it currently probably is unsafe for kids to be alone in public parks.
But that is not because american parents hold dogmatic beliefs about kid independence, they're just making a judgement call based on how unsafe parks currently are.