How do you think, how do we think?

It's weird, I think I've come accross one of the things that I just cannot understand. How do humans think? You know your physics teacher tells you that we cannot comprehend the size of the universe. Well this is kinda like that. I don't want your scientific explanations of what and how we think. I believe that to be bull^&*(. Instead I want you to take a fresh look at the way you believe we think.

When I see a cold and lonely hobo on the street I try to help him or at least stay as far away as possible. Once I grasped a can of pepper spray from my pocket and sprayed it into a hobo's face. I don't know why I did it but the fun just took over. Seeing him squirm. How do we create evil within ourselves? Do we?

Or is it there from the start?