Why does it need to be either/or? I make do almost the entire week without a car. Schools within walking distance, then mass transit to work.

So what if I own and use a small family car, to go shopping and take the kids places?

Let's not let the perfect be the enemy of the good.

My neighborhood is a real life 15min city, and most people of all ages choose to walk. We don't need to prevent families from owning a car and taking it grocery shopping once a week.