It's funny the difficulty that car owner show at understanding non-car-owners. Why would you assume that someone without a driver's license would go on vacation in a rental car in the first place?

By the way, this might not be true in the US, but in other places there's usually some sort of shared transit. Even if it's not a city bus or a ride-sharing network, there's usually some person with an unofficial "taxi" that drives others if you give them a call, or someone with a passenger van that makes a weekly trip to a city for a few regulars.

Old and poor people everywhere can't drive cars, so these solutions are widespread, you just need to ask around (calling the local shops usually does the trick).