I think that any definition of human for these purposes has to include the fact that we are a social species. Frameworks of values, which is what I think secular humanism is, make no sense in the context of a solitary, non-social species. It's our social nature that makes secular humanism relevant. So yes, human is simply a shorthand for the species homo sapiens, but secular humanism itself is contingent upon our nature as a social species, so it's more than simply identifying us as a species; it's dependent on specific aspects of the nature of our species, including things like general values that our specific species inherits from our social nature, such as valuing fairness. The whole complex of our moral and social mores would then be essential for defining the 'human' in secular humanism.
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