This is interesting.  According to an article on discovery.com we are hard-wired to react to unfair situations.

Disgust over an unfair or immoral social situation is hard-wired into the human body as strongly as the reaction to a foul taste, according to research published today in the journal Science.

The idea that this study is conclusive is a little difficult, and the problem, especially understanding brain elasticity, is that things that are learned can appear to be hardwired.  Is this facet like language?  We’re hardwired to learn language, but what language we learn is not necessarily pre-determined.  Anyway, I’d be interested in hearing your thoughts on this.