I mostly agree with Roody's sentiment, that some people who use a car use it out of necessity....... but that most people who do use a car out of necessity, as well as the majority of people who don't need a car, would use one if they can afford it, regardless of whether there is a fairly convenient public transit or bicycle alternative.
I consider littledog to be pretty much right on the money, though, that calling people cagers out of pity or out of contempt (and if someone is told she's pitied when she doesn't think she deserves it, it will feel like contempt) does little to further our cause. Making people angry can work sometimes, but in this situation I think it's just a way to make enemies.