Well - he made it easy for you because based on how he phrased it, you only had to come up with one reason cars are good. You picked some low-hanging fruit (not an ad hominem attack; your reasoning is sound). Cars are a clear solution to certain problems.

That said, I think that these reasons tend to diminish when contrasted with the downsides (not that it matters, but I do own a car, and am not just trying to shill the other side). Example: having a car also contributes to the degeneration of the city. This is a point well-illustrated in the original article. Is it worth owning a car when it is intrinsically tied to urban sprawl and the decay of cultural vibrance? Ownership comes at a cost.