FYI, the author of that post address self-driving cars in his next post: http://progressivetransit.wordpress.com/2012/02/02/self-driv...
That betrays the basic attitude of these anti-car folks. It's not the cars, but the freedom to live where you want that they detest.
My car is kind of a form of taxation in that regard; you can't get around safely without it. There are few sidewalks or bike facilities, so citizens must own a car whether they want to (or can afford to) or not.
Isn't the freedom to choose how to get around as important to you as the freedom to choose where to live?