Generally, I have to agree with naughty about this one. Though, I think we have to be careful about what we call "evil". In the most primitive conditions we commit all sorts of evil acts because they are necessary for our own individual survival and that of the species. If it is necessary for survival, is it evil? I think so. Civilization teaches us to be good (but only so far as we can afford to be). If resources become scarce or danger is perceived, evil acts become the norm.