No seriously, "human nature" is like "Murphy's Law". It's a general figure of speech referring not to any specific science or philosophy to speak of, but rather simply to a lazy reasoning out of something.
The scary part of your post is that you try to explain a non-scientific term with bad science and a bit of religion (like intelligent design). "Evil" is a vague religious term. Genetics is biology. Behavioral traits are psychology. A murder/rape can be explained usually by psychology, and on occasion biochemistry of the brain, but if you're going to use religion you can't use science without creating a terrible mess.
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