> This happened en masse many decades ago in America.

There was a name for this trend - White flight.

I grew up in southern suburbia and in walkable southern towns - they do exist, in pockets.

I learned two things from my experiences. First is that anywhere there is foot traffic, you will get homelessness, panhandling, crime, and just generally people you don't recognize. It's not because big cities aren't being policed adequately or anything policymakers are doing, it's just something that naturally comes with the territory.

The second lesson I took away is that we as a society often can't tell the difference between "This place makes me feel uncomfortable" and "This place isn't safe." Despite all of those issues I outlined above, I felt very safe and comfortable living day to day in urbanist spaces.