[eli_gottlieb]

>And, in that respect, it's quite easy to see that helping an old person who fell down to get up is something good, while raping children is not.

I think it's a bit more difficult than that. After all, in many cultures, it's fine to rape children, as long as you rape the right children.

[coldtea]

That would only mean that morality is relative across cultures, not that morality doesn't exist within the same culture.

[eli_gottlieb]

That doesn't really get to the heart of the question, as regards the social psychology of morality: why has some culture arrived to the particular moral notions it teaches and enforces? What properties, objects, or circumstances are they representing?

[coldtea]

>why has some culture arrived to the particular moral notions it teaches and enforces?

Based on its history -- and because enough people came to believe that such a moral code promotes its wellbeing and interests better than alternatives.

[eli_gottlieb]

That is no kind of precise causal explanation.