Humans in space may be the only place where there is peace in the future.
Take a look a this old world, and you soon realize that our exiting into space will happen for the same reason Europeans left Europe for the New World.
We do need humans in space.
The human body dwindles and deteriorates in zero g. After a lifetime of observing this childish fantadt of flight and escape and science fiction, the obvious conclusion is that it will never happen. We are stuck in our sins on this world, and the only way off is repentance.