I think in line 35 it mentions that "pedestrians rarely act this way towards each other" to explain how things are better in the urban environment that keeps people out of these antisocial/driver oriented behaviors.
I think (E) is wrong because it doesn't seem to have much support in the passage. Sure, we could imagine that (E) would be one detrimental result, but do we see it in the portion of the text where the author is discussing the detrimental result of using an auto every day?