What is the nature of man?

With the upcoming release of the new Hunger Games movie I was reflecting on how much of the nature of man has been portrayed in literature and film. Reflection on the Hunger Games and books like Animal Farm and Lord of the Flies has made me wonder why we portray human nature in such a way. These pieces do involve deep concepts of the nature of man and ethical questions about behavior and being, but why do we focus on the negative behavioral tendencies of man. What should be portrayed is triumph over such things. Triumph over the natural man. Each one of us here on earth has the ability to choose and it is sad to say that in history we have seen some of the most horrifying acts of that ability by those in power to exploit, harm and even kill others. In the stark contrast, there have also been those who have used this ability to lift up others, fight for rights, and blessed the lives of many. The world is really what we make of it. We can view the world as man is just out to get what he wants or man can come together for a common good; we can also choose if we want to expand or minimize such a view.