"...for there's nothing either good or bad, but thinking makes it so." says Hamlet to Rosencrantz.

Claim to ultimately know whats good and bad and you are already trapped.
You can sometimes categorize certain actions by the effect is has on all beings involved, but even that can be utterly shortsighted and misguiding.

Your assumption appears to be that something ultimately evil exists.
What makes you thinks so? One of the theist religions?

There are enormous levels of confusion and neurotic patterns that make people do things generally considered "evil". Usually, these persons have learned a normality that foresees no consequences of their deeds. Be it a generallly humanist upbringing, a humanist christan approach or the concept of karma.

Looking deeper to the substance of reality?
Thats quite an ambitious approach.
First thing may be to drop the word "evil" and replace it with "profoundly confused".