Comment by antonvs

A big part of the problem here is that this conspiracy theory plays right into what its followers want to believe anyway: their idea of an ideal city is one where you can easily get anywhere by car, and there are lots of highways, strips, other roads, and plenty of parking.

It's what they're familiar with, and any suggestion that it could be improved by catering less strongly to individual vehicles and with a stronger emphasis on public transport, bicycles, walking etc. is automatically resisted. The conspiracy theory fits this bias perfectly.

It's not so much that they have "opposition to livable cities," it's that they have different beliefs about what's livable.