There's also the matter of the effect on the urban (and suburban) environment, something which more directly effects most people. Widespread car usage is enorm

There's also the matter of the effect on the urban (and suburban) environment, something which more directly effects most people. Widespread car usage is enormously destructive in this sense, because of insane amounts of space it requires (and the degree of danger it introduces). The bicycle, well, not so much (and pedestrians even less, of course). The negative environmental effects of cars is well-publicized (and apparently politically effective) but it's hardly the only, or even the most significant, problem with widespread car use.