Thistlehart said:
You repeat, in different words, most of the point of the Pratchett quote. Well done! In essence, I think, it is meant to convey one taking on the responsibilty of seeing to others' wellbeing by claiming them as one's own and making them part of one's self.
I'm not sure what I'm saying was the same - I was stressing that what a family/community follows is something (usually a worldview or set of values) that no one person in the community necessarily ever had. Taking someone's pre-existing interests and internalizing them, which I believe is what you and Pratchett were talking about, is quite a different matter. Maybe someone only cares about survival, for example. I can choose to sympathize with his cause, but that doesn't make me part of his/her family, even if we actively work together for it.
The best analogy I can think of off the topic of my head would be a band of soldiers. Maybe they go to war as part of a loose, impersonal military organization, but they emerge as a band of brothers (even if they no longer care at all about the political values of their home nation). Even further, let's say they decide to hire a mercenary to help their cause - that merc still may not be welcomed into the brotherhood even though they ostensibly fight for the same cause, because his/her values differ, and the soldiers choose their values over his.
And how is this not an action based in self-interest? They chastise themselves for not properly upholding their moral code. There is disappointment and embarassment among the family that one of theirs did not do what they thought was the proper action, fearing what it could mean for them as well as the family member who was violent. Self-interest is not always based in survival.
You could frame it as self-interest, but that oversimplifies the situation. Why do you think they chose that particular moral code over any other? If they were only following self-interest, how could they (or anyone) even arrive at a conception of proper action, let alone one that differed from everyone else's?
First off, let's just stop talking about 'honesty' about human nature or any conception of what's true. Let's get straight that we only have our individual bias' and the most either of us can do is convince the other of why they should take up our view.
I don't subscribe to any such simplistic understanding of the value of selfishness or selflessness, though I do tend to see egoistic views as naive and misguided for various reasons. I was never arguing for ethical altruism though (the view that you should sacrifice all you can indiscriminately for others).
So why should I believe in your view, which seems to me to reduce to egoistic hedonism, where humans are basically conceived of as pleasure-seekers with no ability to perceive or strive toward a higher purpose? It allows us to rest on our laurels, discard ethical and philosophical responsibility (maybe killing others makes me feel better than helping them?), and never try to lift ourselves up to noble action? What does that do to give meaning/purpose to human life? I, for one, would never want to be part of a 'family' where the others only treated me well because it made them feel good (they may as well get a pet instead) and not because they want a genuine human relationship with me. I don't want to live in a world full of pleasure-seeking zombies.
Why not believe in a humanity that can lift itself up to nobility, seek higher purposes, not just because it makes them feel good, but because it's what's right, can have consciences that can tell the difference, can have genuine unique interpersonal relationships in which they do not treat each other (consciously or unconsciously) as objects that dispense pleasure?