Growth at any cost is the human way. When humanity stagnates we start getting antsy and when we start getting antsy people start to do things that are destructive.
We need to figure out how to navigate space. We need to figure out how to colonize other worlds. There are asteroids out there filled with all sorts of lovely minerals for the taking...
Minerals you say? Well then, let's go! After all, nothing "destructive" has ever followed mans quest for minerals on our planet, right? I mean that whole thing about blood diamonds, I'm sure it's just a myth. And scientists have now proven that the vacuum of space is going to suck all the evil from capitalistic greed and turn it into a magical utopia of growth and prosperity.
Human behavior will not change in a vacuum, so I fully expect to see countries waging warfare over asteroids or planets. History has proven this, and continues to today, so wake up.