Saying this, he turned his head toward the window as if he were trying to solve the problems of human existence by concentrating on the beauty of the universe.
It isn't that they can't see the solution. It's that they can't see the problem. They can't see the problem if they are looking in the wrong place. They can't see the problem if they have blinders on - for 'none are so blind as those that will not see'.
A problem is something you can do something about. If you can't do something about it, then it's not a problem, it's a predicament. That means it's something that must be coped with, endured.
The world is not something separate from you and me; the world, society, is the relationship that we establish or seek to establish between each other. So you and I are the problem, and not the world, because the world is the projection of ourselves, and to understand the world we must understand ourselves. That world is not separate from us; we are the world, and our problems are the world's problems.