I don't have a car - I live in a city and it would be a stupid waste of money and effort. My DS went from the age of 4 to a primary 40 mins walk away, so he walked 40 mins every morning with me to school. And you know what? It was great. He got exercise every day, we had some quality chatting time, and best of all, he started school already having had quite a bit of physical exercise and jumping about, so ready to sit down and settle into working.
He learned very early on that walking somewhere wasn't a big tragedy - it wouldn't occur to him to whinge about walking somewhere, when lots of his friends do. There's no such thing as poor walking weather, just inadequate clothing.
And he also learned to navigate public transport very early with me. He was an early reader, not because I'm a particularly good parent or he's a genius, but because on walks or on the tube or a bus, you are surrounded by words - shop signs, adverts, things painted on the road - and he got curious about them all. Now he's old enough to make short trips by himself (eg to his secondary school), tube maps and bus maps hold no terrors for him at all. He's been able to navigate the tube for years, now.
On the very few occasions we do need a car - eg transporting stuff too heavy for me to take on a bus - we take a cab. And get there quicker than people who have driven their own cars, as we can use the bus lanes.
I think it wouldn't have been fair on him to teach him that he's helpless without a car. I don't think it's fair on him or all the other children to make pointless car journeys and screw up the planet more than we already have. I don't think it would have been fair on him to have deprived him of exploring where we live in favour of sitting in a stuffy metal box, just for my own convenience. I don't think it's fair on him to contribute to poor air quality where we live.
I was working on my sister's front garden in suburbia a while back, and watched in amazement as the next door neighbour put her small (perfectly able) DS in her people-carrier and took him to school, and returned a few minutes later. I happen to know this child's school is in the same street as the one where they live. That's my notion of being unfair to a child, OP.