I haven't seen the movie, or even heard of it 'til now. While I think that saying, "cars make people lazy" is simplistic, there is some truth to it. Anything that enables a sedate lifestyle promotes a sedate lifestyle. The human body get strained - very quickly - to be more or less active. Contrast this with health experts preaching the "active lifestyle." I don't think cars are particularly evil or problematic in the sense of promoting laziness on their own, but they are a big part of a society that promotes inactivity.