I was vague about helping others on purpose because experience has made me wary of claiming that I know what's good or moral. Fundamentally I would only claim to know better than evolution in two cases: 1) Jeopardizing the ecosystem/biosphere (because it would be suicide). 2) The need to get off this planet before it gets eaten by the sun (because I don't think evolution properly accounts for this). That's not to say that I claim to be amoral. Rather, in the name of humility, I'd stop at the definition: Being productive in a responsible way - guided by the two points above. My reason for this is that, in my experience, the worst consequences of human behaviour stem mostly from indifference, whatever the intention may be. And the promise of having a positive impact often makes people as blind to terrible consequences as the opportunism often associated with selfish behaviour. So I tend to limit how I express myself in this regard, because I think it's more honest.