If “evil” is too strong a word (which it probably is) then read “selfish” or “self-centred” but the question remains.
Personally I am pessimistic in my belief that individuals are entirely motivated by self-interest and that there is no such thing as a real act of charity. That on the surface the individual may appear to be kind, but as Shakespeare said in Lear “beneath is all the fiend’s” under that mask of civility lies something much darker, something done entirely for the benefit of the self.
So in short, are human beings inherently selfish, or even potentially evil?