Absolutely but I am covering suburbs in both countries not inner city. This is where people with children tend to move out where there is more space, greenery etc. I am remarking on the different design choices. I am not denying fear exists in the US but I don’t think it actually plays a role in how American suburbs are designed.

This is a question of following very different zoning rules. E.g. in Norway one zones for far more mixed use, and for more public space. In the US public space is kept at a bare minimum and instead maximum private property emphasized.

This is a lot due to very different political and cultural traditions. America is very individualistic and capitalist oriented. Norway has a deeper socialist/collectivist tradition where doing things together or for the common food has a stronger emphasis.

Nordic countries have a lot of housing cooperatives which is a rarity in the US.