But I think evil run into two issues.
1. Its a description for something else, which people can't agree on what is.
2. Its not objective, but subjective
I know people would like to say that it is objectively wrong to kill and torture children or whatever. But I think the truth is that it is not. It is simply agreed upon as being under the term of evil, but as we have seen in history, people have sacrificed children as well as adults, because they were convinced that it were for the greater good, so were they objectively evil people or simply greatly mistaken?
Many philosophers are also psychiatrists and study thr neurological implications of empathy.
Empathy has been scientifically proved as something that does happen.
It develops when the right lobe and left lobe of the brain trade information continuously.
So just think of what happens if the two lobes cannot communicate.