What makes people evil? Can't it be argued that any person that is evil, technically has a mental illness? Wouldn't that make it not the evil persons fault that he/she is evil? So technicly the good people have no room to criticize the evil people because these 'good' people are only such because they have not developed this mental illness we know as 'evil'?
So debate; what makes people evil? or rather, what is evil itself? (whether it be mental illness, or some other reason). and please leave religion out, unless we're speaking about the affect the religion has on a persons mental state.