If services aren’t within 5-10 minutes maximum, people will not walk or bike there. That’s often greater than the distance just to get out of some neighborhoods.

If public transportation is not within 5 minutes or so, people will not use it.

The cost of a car can be under 10/day. If public transport is even half that for full day multistop use, people won’t use it.

Humans have a complex history of great community, but also we kill other humans… A lot. Others are dangerous by default.

Why young children assign better attributes to some dolls regardless of their own culture may be an open question, but colors likely have their own bouba/Kiki effect.

Go read ncbi, it’s a trivial search… Babies as young as 3 months prefer own race, and children as young as 2-3 exhibit doll preference and attribute more good attributes to white dolls. Racism and sameness grouping starts very very early and is not entirely socially learned… Its basis is innate and instinctual.

You should read more studies on babies. They absolutely do have innate bias. Your post screams “I’m just guessing”

Determine which habits are good, bad, neutral. Then anything good or neutral, determine good frequency. Then cycle frequency to optimize utility vs. adaptation/addiction/increased requirements. Anything bad, eliminate.