What is right and what is wrong and how do we know? But that is not the claim here. Good and evil, these are just analytic terms that emerge out of what is there in the giveness of the world. Put plainly, ouches and yums actually exist, but they're not things "at hand". — Constance
It sounds like you're coming close to saying good is pleasure and evil is pain. You could build a moral system from that. The quest to discover what ethics really is would be completed?
I think there are advantages to occasionally looking at the world through an amoral lens. Judgment and understanding stand in opposition. The more you judge something or someone, the less you understand, because once the judgement is made (that was evil!), there's no reason to look further. Understanding requires putting judgment on the shelf. For instance, if you think about the most aggressive, toxic person in your life, consider that angry, aggressive people usually feel weak and afraid. People who try to manipulate others feel like they have no control. People are contradictory. People who are in pain sometimes lash out to cause others pain. Plus causing pain can be a form of self medication because it feels good to stomp downward. It makes you feel powerful, and a dopamine burst is apt to accompany it, producing a feeling of accomplishment. In other words, the question ethics doesn't spend much time on is: why does the abuse exist? Step away from ethics into nihilism, and you can see how so many people are trapped in a web of grief and rage, most born into that web. Instead of lamenting it, see the way this web shapes identities and grand dramas that play out over generations.
Remember the Shakespeare play where everything started off great, everything went well, and then there was a happy ending? There was no such play because it would have put the audience to sleep. The mind seeks out the painful because it's dramatic. The story arc requires pain in order to have something to overcome. Consciousness itself is a story arc. This is Schopenhauer's pessimism.