This phenomenon has many many causes, and does not represent any statistic on a parents caring for their kids. It is ludicrous you would think so. Please provide at least one study that shows some form of causality.
lots of developing countries have way stronger communities. in these places you can raise your kids in a more "free-range" style and nobody will give you shit about that.
agreed, they collectively care more, would be my view. In many neighborhoods in the US, people only care about themselves, no one else. They don’t even know their neighbors.