Are people inherently evil?

[Edellus]

I would define "evil" as the desire and/or action of doing harm just for the sake of doing harm and/or out of pleasure (on the surface level, I think it is for revenge of some sort).

Given that definition, yes; some people are inherently evil and nurture/socialization can only help to a point. Socialization is merely a method for people to live together without having to worry about being killed that much while you work together, and that is not exclusively human. Every hierarchy structure which involves living beings has to employ such a method because otherwise you just get more enemies.

For example there are socio/psycopaths (I'm still not sure on the consensus of those 2 words), people who are made aware through socialization that some things are bad and others are good, but these people don't think them as inherently good or bad at all, they just know that that's what we think and if they want to have a comfortable life they should follow these morals and so they do. That's the thing that bothers me about the "teach boys that rape is wrong" thing, saying as if rapers rape because they don't know it is wrong. They know it is wrong alright, they just don't care. Now, socio/psycopaths aren't an example of "evil", since the vast majority aren't evil, but more of the limits of "nurture" and socialization.

It is natural to be "nice" and "evil" sometimes (emphasis on "natural"). We have millions of years behind us of evolution while living in hierarchical structures; it is built into us. Now that we attributed it to morality is a different thing.