I live in a small town, but work on farms and in the surrounding area (same places that bring us food). I am carrying materials and maybe 80 kg of tools about with me several miles to fix and build things for people who can't. Daily stuff about town is on foot, and I never buy more than 2 bags of groceries (just can't afford to).
I think your blanket condemnation of motorist needs examining with a little more honesty. If you'd rather not, that's fine too. I know my vehicle is a necessity not just for me but for all those I do work for (some paid, much not). Not being a city dweller, however, I see food from field to plate along with all other goods and services that it takes to allow modern city folk to live where they do. I'd rather cities became a bit less intense in population density with a lot more self sufficiency, but acknowledge the problems so tend not to judge such people too harshly. For the rest of us, it would be nice to be afforded similar respect.
And yes, there are plenty of people who have cars to keep them from ordinary exercise, as status symbols and unnecessarily large and expensive for what they use them for (buying too much shit). But for a majority outside city centres I would say necessity comes first. They're not exactly cheap in terms of tax, repairs, fuel, insurance etc. For most of us of our livelihood didn't rely on a car we wouldn't have one.