Also,cars are an important part of most economies, but less so in bigger cities - and it points to the fact that a)they weren't always so and b) might not always need to be, maybe there's a better way, which is what some posters are suggesting. If you Remove the necessity of a car for some people, and make alternatives better, then there are probably a lot of benefits (pollution, construction costs, congestion, safety) to it. But no one (or very few, I guess, since this is HN and lots of opinions) is suggesting arbitrarily and unilaterally getting rid of cars.
This is free advice, so you can take it for what it's worth, but if you've ever found yourself suffering from a limited amount of trust or respect from others, consider that it may be due to your apparently limited respect for the truth. Or basic English.