Atthewells, I think you have issues with your sibling, and your elderly relative.
I well remember driving my non driving sister to see elderly relatives in hospital, and yes, it does get tiring if you're the only one who can drive. Hope your elderly relative is better.
You seem to have got people's backs up by generalising about "people who don't drive are a pita." When in fact you are having a particular whinge about ferrying your own sister about, and being the only one who can drive your elderly relative (when in fact a taxi would do a s well)
Maybe deal with the problems in your and your sister's relationship of give and take before starting a fatwah on MN against "all" those who choose for whatever reason not to drive or own a car.
As I said I used to drive a lot and even had my own cars, (sequentially, in case you think I had a garage stuffed to the brim with them) but now I cycle, take public transport use taxis and take lifts from those who offer. I get my groceries delivered.
Actually, I prefer my non driving life as I interact a lot more with folks when I'm out and about, and that rattles me out of any prejudice or narrow thinking I may have slipped into. Helps me get some perspective about people I may have had a rigid opinion about.... other people's kids for eg..
it keeps me and the planet fitter too, so that's well handy.
You should give it a try maybe!