Americans would rather die than give up their air conditioned bubbles on wheels. I've wondered why someone hasn't tried manufacturing an enclosed go kart with AC and enough trunk space for a few groceries.
I see these all the time here in the Netherlands. Very small cars. Some on the road and even smaller ones people drive on the bike paths. Small motorized vehicles, ebikes and scooters share the paths with regular bikes which works because they have usually at least two lanes, so they are more like tiny roads. Very handy.
You say it like its a bad thing.
I get it if you live in a dense metro. A car is not worth it in NYC, SF, etc. Other than that it's pretty abnormal for people not to want a car. It's usually some weird anxiety about driving. Not to mention - heaven forbid - you have a family.
Because they are completely unsafe against a twice-the-height, multi-ton Ford pickup truck.