On one level, why do we care much if the victim lived five miles away or five thousand? Nationalism and political boundaries aside, human beings are human beings. Why should the suffering of a fellow human in Africa concern me less than one in Boston?

I don't mean to imply we shouldn't care, I'm just puzzled at how we decide which things to fret over.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman