I imagine since in the US, no one walks and there is nothing of interest outside, anyone who is out standing around is probably engaging in some criminal activity.

What a sad society where this is the case.

It’s often in areas that had factories or businesses that are closed and there is nothing but vacant buildings lefts for the underworld and marginalized to live until the next development.

Might as well use the abandoned property instead of letting it go to waste

That's a pretty broad brush you're painting one of the largest and most diverse countries in the world with.

Certainly where I live, everyone walks, rides bikes, and spends a huge amount of time outside.

> there is nothing of interest outside

Whew. I don't even know where to start with this one.

If this is how you perceive the United States, I think there's a huge opportunity for you to learn more about this country.