> I often say if 51% of the population were psycopaths then they would not be psycopaths but normals and the other 49% would be the exceptions and outcasts in many ways.

There's good reason to believe that such a world would be unstable. When too many people are willing to take advantage of too many other people then you will most likely have a tragedy of the commons [1]. Co-operation and altruism appear to be very important components for the evolution of species and the advance of civilization.

> After all not all psycopaths are criminals

This is true, and as with most things in life what's important is balance. As the article discusses, psychopaths tend to live "in the now" and have a very present-oriented time perspective, which certainly has some value. But too much of a particular time perspective, in this case with no past- and future-oriented time perspectives, creates a distorted map of reality [2].

[1] http://en.wikipedia.org/wiki/Tragedy_of_the_commons#Applicat...

[2] http://www.thetimeparadox.com/