I'd love to answer that but it's directed at elliemay and having read a few of her posts I think she will answer better than I could.

This thread has become confusing though. Some seem to be addressing evil as a concept, some as an act or behavior, and some even seem to be saying that evil exists as a material entity.

When people do things that society has deemed bad/abhorrent/horrific, it's condemned because it is bad/abhorrent/horrific. Whether you use the word "evil" to describe those acts is irrelevant. Some of you have somehow concluded that some of us have disputed that there are evil/bad/abhorrent/horrific acts.
I don't believe anyone has and I'm curious about how you came to that conclusion.
My first post contained levity but that is the way I believe morality and the concepts of good/evil came to be. How else? And I'm sure it isn't an original theory either.