Because they likely have skills you don't. Plenty of people are unable to use a calculator, a computer, a car, a cell phone or any other electronic device. This doesn't meant they're stupid or uncapable of working, they just haven't learnt how to use these devices because they weren't invented yet and/or didn't became popular until recently. It's like trying to teach an adult how to write or read, not an easy task. My late aunt, for example, was unable to put on a washing machine, and she refused to learn how to do it. She'd rather wash clothes by hand, like most people did a century ago.