I think looking for one single cause in any complex transformation is a bad idea, but like most myths, it's an exaggeration of a kernel of truth.

An equality frustrating myth is the idea that pure market forces led us into our current auto-based transportation system because it's just superior to public transport in every way. I think were that the case, public transit would have waned more evenly worldwide.

But I am curious (genuinely) about the other alternatives you mention.