So can I, but I can't think of many that share the magnitude and ubiquity of cars!
(You shouldn't read this as a fixation or totem: there are plenty of other problems in this country. But it isn't a coincidence that aggressive deurbanization/suburbanization is closely tracked by increases in isolation, which in turn is tracked by a decline in personal trust[1].)
I can: the destruction of religion as a civic activity in the US. I'm not even religious but that's a huge one.
Another is the effort (by HUD and others) to eliminate regions of ethno-cultural homogeneity.
Both of these are A) much more numerically significant (on a per-capita basis) than changes in vehicle use since, say, 1950 and B) well-understood to reduce social factors like trust and cohesion.
(You shouldn't read this as a fixation or totem: there are plenty of other problems in this country. But it isn't a coincidence that aggressive deurbanization/suburbanization is closely tracked by increases in isolation, which in turn is tracked by a decline in personal trust[1].)
[1]: https://www.pewresearch.org/politics/2019/07/22/the-state-of...