Google defines evil as profoundly immoral and malevolent. It then turns around and defines malevolent as having or showing a wish to do evil to others.We know morality is subjective and dependent on the observer. Therefore, we can discard any mention of morality when it comes to logical thinking. Even with this concession, the definition of evil is truly lacking.
Do we say a lion is evil for hunting and eating an antelope? Do we say a man is evil for going to a forest and eating a cantaloupe? Do we say a man is evil for taking pleasure in the pain and suffering of others? It is all subjective therefore any discussion about "evil" has no place in a logical discourse. When someone says so and so is evil, we can safely disregard their argument because the whole premise doesn't matter.