OP believes in that there exists a concept known as 'good' or 'evil' on a supposed continuous spectrum but I on the other hand don't see such ...
The idea of 'good' and 'evil' should be beyond most of our comprehension of relationships in our physiological life. What I imagine that OP wanted to know is if whether or not some humans are born with negative tendencies in behaviour ?
Now, how angry would OP get if I said that this is NOT a political matter and that the question above implicated is ascertained to be a fact of life instead ?
Just as people are born with different abilities why couldn't the same be said of behaviour ?
It's been found that violent criminals such as killers and rapists can be more frequently born that way ...
I believe OP, that your frame of reference in assuming that all people who are born with near identical environmental conditions should attain similar lifestyles but that is simply not true when people are also born with different physiological properties that also affect behaviour too ...
Just as how we are hard coded to react and respond to the environment around us, nature will return the favour to us. How exactly does one define 'good' and 'evil' if only a single man in the universe to exist ? (You're mistaken if you think that nature and nurture is separate, nurture is a part of nature.)
So to answer your question OP, yes there exists some people who are inherently relatively malignant to begin with ...
