My supporting POV on selfishness motivating human moral values

[robvalue]

I think if you regress the motivations behind morality you'll eventually hit on something that could be deemed selfish, but I think this is unavoidable because the morality comes from / is permitted by us so it must have a reason rooted in ourselves. Even if you've been brainwashed into the morality, you could still say you stick to it because it feels uncomfortable for you not to.

With the spider example, if I find one in the house I don't kill it. I never would. I could, and clearly there would be no serious consequences. But I don't, because I never want to intentionally hurt anything. Obviously this is an impossible standard to live up to on the whole, life is full of compromise; but in such cut and dry situations, I can avoid doing harm. I either leave them, or capture them and put them outside.

So is this morality selfish? On the surface it is not, but you could ask why I don't kill the spider. I don't want to take away it's life. Why don't I? Because I value life. Why do I value life? Because I want everyone and everything to have the best experience they can have. Why do I want this? Because it is what I would want if I was them. Why do I care, if I am not them? Because I feel a sense of kinship with other forms of life. Why do I feel this? Because hurting something else ultimately feels like hurting myself, and makes me feel bad. Oops, selfish!?