There are places where this is just not possible. I live in very hot climate and people would be dying all the time due to heat exhaustion and dehydration if this was the case. I don't necessarily disagree with you, but you can't simply say, fuck cars. It doesn't work this way everywhere. I would say that public transportation needs to be greatly improved upon and invested in though.

I've lived in places where I don't need a car and it's great and shitty. I've lived in places where you do need a car and it's great and shitty. I've lived in places that have great transportation and it's hot, but again, it's great and shitty. There are trade-offs with whatever you go with. I do agree that we should focus more on better zoning and better public transportation.