One barrier to entrepreneurship in the U.S. is lack of health benefits when you're self-employed. There's not much of a social safety net here compared to most of Europe. Thus, one would think that Europe would actually be a better place to quit your job and pursue some startup idea. Why isn't that the case?

If you can get investors backing you, you really don't need to care what your family says.

It is just as cultural in the US that many families are affronted by their children or relatives that choose to try entrepreneurship over employment.