No, the two questions you ask have very little to do with each other. There's a perfectly reasonable debate to be had about the externalities of different modes of transportation, but that is not what I'm referring to.

I'm referring to a relatively small (but very vocal) segment of almost uniformly young and able bodied city dwellers with a fairly narrow and very strongly held set of views about what city life should look like. These people seem to want to hijack urban planning and tax policy to legislate in the exclusive interest of their preferred lifestyle without regard (and often with outright contempt) for the views of their fellow citizens. That's what it means to "impose" their views.

My prediction is that if and when any of this makes its way into mainstream discourse and actual policy, the backlash will be severe and rather ugly. This is particularly unfortunate, since there are plenty of real issues with urban planning and transportation, but instead of real debate we have polarized flamewars over trivialized strawmen (essentially "ban cars, maximize density" vs. "freedom and country living").