I believe there are two true natures of man;
1. The "natural" man = might makes right, survival of the fitest.
2. The "spiritual" man = help your neigbor, love everyone.
and everyone can choose which to follow. An inner fight between two opposites. That is why disasters bring out both the best and worst in people depending on which people have chosen which side.
I think therefore I am? How about, I think therefore I can choose what I will be.