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Nornagest comments on Ethical Inhibitions - Less Wrong
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Well, it's not conclusive evidence by any means, but I did note that we have no hominoid relatives; they're all extinct with a capital E. To me, that implies something more than just us being better at hunting-gathering.
And if we, as a species, did exterminate one or more other hominid species, then it seems a small leap of logic to conclude we did the same to each other whenever similar circumstances came up.
Two points. First, the extinction of nonhuman hominids happened at about the same time as a more general die-out of megafauna. Overhunting by H. sapiens is one popular explanation for why that happened, but it's not the only one, and if one of the alternatives ends up being true (or partly true) then it could easily have affected our hominid relatives as well.
Second, species inadvertently cause each other to go extinct all the time without going to war with each other, just by competing for a niche; consider any of the introduced species that have been causing ecological problems recently. Again, this could easily have happened to our hominid relatives over the timescales we're discussing.
These ideas, of course, aren't mutually exclusive.