When I think about why something is present in human behavior I usually try to relate it to our evolution, as that is my frame of mind.
There is evidence to suggest that psychopathy is a necessary temporary role that must be fulfilled in times of war and conflict. It is evolutionarily advantageous for a military or group to have a few individuals that lack the ability to feel remorse or guilt. When your goal is to wipe out your enemy, it is especially advantageous to have people willing to rape women and kill children. Not only does this wipe out their next of kin but it demoralizes the enemy through its severe nature. If you look at the number of warriors considered to be ruthless murderers, you will find that it coincides with the rate psychopathy tends to propagate in populations.
They will hesitate less. They will show no mercy. They are less likely to get shellshock from the horrors surrounding them.
The interesting question here is what do we do with these disturbed individuals after war ? If they aren't killed they will cause harm in the very civilization that they fought to help. So, it can be assumed—since the disorder was not selected out of the gene pool—that the benefits in wartime outweigh the drawbacks during peacetime.
Psychopathy is not just a disorder. It is a tool that we use for the continued success of our civilizations.
Spatial said:In the grand scheme if everyone were sadistic, we wouldn't make it where we are today. We'd be a retarded species.