I agree building a company just for the sake of building a company is as arbitrary and meaningless of an Ithaca as it is to want to work for say Google. However contributing in a meaningful way to improving the world is a noble pursuit and we need more people doing that not less. Whether we are already at max-capacity of useful contributing people is another question. Maybe the type of person who can build frontends for Google AdWords doesn't have the skills necessary to do something better and should be content providing a service and taking care of their family.

Everybody has to find their own path I guess. Also 99.99% of people don't care about improving the world and the world gets by just fine on its own. Or does it (global warming, war, etc.)? Who knows, who cares.