Why do you consider the behavior of so-called "psychopaths" as a "disorder"? What if a norm here is just a matter of cultural expectations? So, what is normal and what is not can be understood by comparison of an individual behavior when cultural norms don't limit it. And if, then, let's say, 40% of specimen behaves as psychopaths (particularly, manifest violence in the form of a stable pattern), then we cannot call those individuals having "disorder." We have to consider them as a particular segment of the Homo Sapiens population having a specific evolutionary function.
Why do you consider the behavior of so-called "psychopaths" as a "disorder"? What if a norm here is just a matter of cultural expectations? So, what is normal and what is not can be understood by comparison of an individual behavior when cultural norms don't limit it. And if, then, let's say, 40% of specimen behaves as psychopaths (particularly, manifest violence in the form of a stable pattern), then we cannot call those individuals having "disorder." We have to consider them as a particular segment of the Homo Sapiens population having a specific evolutionary function.