I had this theory for a while.
We are insane... all of the human race. We are all clinically insane.
Why? Because we are the only living animal on the planet grasping the concept of life and death, though not really. We just know that one day we was born, and one day we will seize being and that's it.
And this knowledge, this uncertainy drives us insane so we spend our life trying to find any kind of meaning or reason to this terrifying aspect.
And that's where all religion comes from, but not just religion, big social movements, search for stardomn and so on, all this insane shit to be noticed while we are still here to get some meaning out of our exsistence, to asure ourselves we are not meaningless small entities whom are just going to live and die and most people wont even notice.
We apply meaning to things that really has no meaning, all to make sense of this. That's why we are all clinically insane... all of us.