A poor economy doesn't help either. I think part of the fear is not being able to find other work to pay the bills so many of us settle for the current situation... or work on startups on the side!
Yeah- the threat is very real for people underwater on their mortages, with huge student loans, or about to put kids through college. It definitely is an awful position to be in, but a lot of people are forced to do this to make ends meet. It's not just psychological disorder.
It's also tough for people who are actually not in much debt, aren't underwater, aren't in financial stress. Because they can only make do with a few months unemployed. That's a small margin for failure/experimentation/following your "passion".
Whatever happened to the American Dream? These scenarios certainly don't sound like it. A lot of Americans (if not a majority) are in a similar situation.