“Tiger got to hunt, bird got to fly;
    Man got to sit and wonder 'why, why, why?'
    Tiger got to sleep, bird got to land;
    Man got to tell himself he understand.”

Of course philosophy wants to argue it's purpose. Musicians could write a symphony to explain music, if they felt the need, and astronomers could draw a detailed map of astronomy and explain how fast the different sub fields were diverging based on their red shift and parallax calculations?