Atla wrote
Empathy probably evolved with the homo sapiens, originally it wasn't inspired. Inspiration came in later, when people realized that they probably should become more empathetic than the average caveman.
Empathy is an evolved feature where we suffer where others suffer, and are happy when others are happy. So we refrain from hurting them, we aid them. Again I see all kinds of things here in addition to the sheer qualia of pain: us, parts of us that aren't pain but get affected by the pain, them, our ability to guess/experience the state of mind of the other person, our ability to do X, our ability to stop ourselves from actions.
Sounds fine to me. But how pain got there, evolution or otherwise, I would put aside. It is what it is. Like listening to music, say--one ignores the composer, the theory in the moment of indulgence.
So, the prima facie reason for not harming others is quite simple, even though living life isn't simple at all. It hurts, in one way or another. (Why listen to music? It's beautiful, in one way or another.) Is this not the bedrock of a negative ethical obligation?