Even within a single person, there is a plethora of competing thoughts. I have done some traveling, and found that there is a suprisingly homogenous standard of social behaviour between individuals regardless to geography, education, religion, or even familiarity to the other person. One might reffer to this as a natural morality.
People like to be nice to others.
The only variable negatively affecting this is stress. Of course, there will always be a niche market for evil, but amongst individuals this population is very small. On a group level, however, natural morality can be quite reasonably manipulated or even suspended. History is well seasoned with incomprehensably destructive social policies. Group think is the grotesque potential of a global brain gone bad.