Startups are high-risk high-reward. That doesn't necessarily mean they're a bad idea. Expected value can be positive even when probability is low. Moreover, a lot of young people can afford to take a chance on something. If you spend a few years living with your parents and attempting to create something, and you fail, you still have several decades of your life to go punch a clock at Big Corp.

And even if you fail to become Google, you might still make a living. Some people would gladly make a modest income doing something they love, with the possibility of making more, rather than working for someone else making three times as much but doing something they hate.

As for what good comes of it, just think about it. Where do new companies come from? Should we have no more of them? What would happen then?