Nontechnical folks are fine using a computer until they're not, at which point they need to find someone with more experience or become someone with more experience. Many Windows or Mac users rely on a combination of paid support and friends/family with computer experience. But few people know someone with Linux experience, and fewer still know how to get paid Linux support. That's why every story of a nontechnical person running Linux seems to include a Linux enthusiast friend or family member in the background.

> older people simply aren't interested in or capable of learning new things

I agree that people of all ages can be interested and capable of learning new things, even something as dry as learning how to administer a computer. And Linux is a great option for someone who actually wants to learn more about operating systems.

But the overwhelming majority of people who use a computer use it as a tool to do things, like keep in touch with family members, listen to music, write a book, read the news, look up tutorials, draw, make a webpage, play computer games, etc. Unless you aspire to learn about Linux itself, every second spent dealing with Linux driver issues is a waste that steals time from the actual things you want to do.

In those cases it's absolutely cruel to force someone to dedicate time to learning esoteric technical skills before they're allowed to use their computer. That's why the only people I've evangelized Linux to are people I'm happy to continue to support indefinitely or who are actively interested in learning about Linux itself.