Virge comments on The Trouble With "Good" - Less Wrong
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My problem is a bit more fundamental than that. If the premise of utilitarianism is that it is morally/ethically right for me to provide equal weighting to all people's utility in my own utility function then I dispute the premise, not the procedure for working out the correct thing to do given the premise. The fact that utilitarianism can lead to moral/ethical decisions that conflict with my intuitions seems to me a reason to question the premises of utilitarianism rather than to question my intuitions.
Your intuitions will be biased to favoring a sibling over a stranger. Evolution has seen to that, i.e. kin selection.
Utilitarianism tries to maximize utility for all, regardless of relatedness. Even if you adjust the weightings for individuals based on likelihood of particular individuals having a greater impact on overall utility, you don't (in general) get weightings that will match your intuitions.
I think it is unreasonable to expect your moral intuitions to ever approximate utilitarianism (or vice versa) unless you are making moral decisions about people you don't know at all.
In reality, the money I spend on my two cats could be spent improving the happiness of many humans - humans that I don't know at all who are living a long way away from me. Clearly I don't apply utilitarianism to my moral decision to keep pets. I am still confused about how much I should let utilitarianism shift my emotionally-based lifestyle decisions.