Why Complain?

I'm wondering why some people feel the need to complain when they seemingly have it all. Not enough this, too much of that, pay too much for this, not enough for that, bladdahbladdah blah blah blah. You could have a headache like I do right now, that is totally stress induced because I'm am trying to overcome your mistakes and errors. What do I see from this? My salary, which isn't low, but isn't worth putting up with this B.S. either. I think I'd like to have a mindless job somewhere. Maybe I could work at the Chamber of Commerce.