You're not wrong. But some people don't like to stare at a computer and program for 8 hours a day and then go home and keep doing it. They may have other responsibilities or other hobbies, or just a highly active social life.

There was a time when I was younger where I spent a lot of time outside of work programming, but I also didn't have any other hobbies (well, playing video games doesn't really count), no responsibilities, and almost no social life. Now that I'm older and have all three, programming at home is a luxury I often choose not to do. But that doesn't make me a bad programmer.