I get the impression that your reasons for not using, selling your car are purely financial?
No, our reasons for selling our car were that we didn't need to use it and neither of us could be bothered to drive it for the sake of it. Hence, it spent over 6 months before we sold it sat in the garage with a flat battery. I don't see any advantage in paying out for insurance, tax and maintenance to keep a car in the garage with a flat battery. We'd much rather spend our money on other things that we get pleasure out of, like bikes, computers and clothes.
In an ideal world, where I had unlimited money, and could have anything I wanted, I'm still not sure that I'd bother with owning a car. Having more money wouldn't make me more likely to want to use it, and there would still be the hassle of having to organise insurance, tax and maintenance for a lump of metal that spent its life sat in the garage with a flat battery.
The disadvantages in not owning a car in a rural area are not financial they are that you become more limited in your opportunities and as you have suggested some journeys become almost like a military operation where as if you have a car you can just jump in it and go. Cars, bicycles, public transport all have their place, but as good as cycling is, a car is a pretty quick and painless way to travel. Some people have no option but to drive.
There are no financial disadvantages in not owning a car, so I can't argue with that point. However, having grown up in a rural area (3 miles outside a tiny village in North Devon that had a bus to the nearest town - 8 miles away - once a week), I can see how a car is more convenient, but I'd definitely dispute your argument that some people have "no option" but to drive. If I went back to live there now, I certainly wouldn't buy a car. Tesco deliver, after all.
I also never suggested that some journeys become almost like a military operation. I think I mentioned that I'll probably put a Rixen Kaul fitting on my road bike so I can just clip a bag on and go if I want to get any shopping. I'm not sure how clipping a bag on the bike is a military operation.
Honestly, if you want to spend your money on owning and running a car in preference to other things, that's your choice, and it's totally fine by me. But stop trying to force your choice onto other people by claiming there aren't any alternatives.