To answer this question, we first have to define evil. Not as easy a task as it seems.
Morals and standards of behavior come with the society you live in, as well as your own lifestyle and ideas. Some people would call something like pornography evil, whereas others would call such self-indulgence a good thing. Stealing is considered evil by many, but it also varies depending on the viewpoint of the people.
Some even consider murder to not be evil, even though they don't like the idea. But as hard as it is to answer, what is truly evil? Is it, like time, simply a standard we set to suit our human craving for control?
And can we really call pure human nature, which is of course natural, evil? What about animals? Do their instincts drive them to commit evil deeds such as killing for food and dominance?
Perhaps humans have this thing called 'evil' because unlike most species, we have the ability to resist our natural drives.
I love these philosophical conversations! xD