This guy is really ignorant. It's the same mentality that thinks the valley is impervious to bubbles and inflation. What? Really, "you get the satisfaction of knowing you aren’t a complete tool bag every time you wake up in the morning."... They may have lost their jobs, but you lose at life.
Yup - More than that - he thinks his limited value system applies to everyone.
Maybe he's never considered people do those jobs because they like them, because they are good at it, because it's dynamic, because it's lucrative, because they think it's an essential part of our society?
You know, similar reasons that people do startups.