You are making an unfounded assumption, that Neandathal-Us hybrids are themselves fertile, and that we are therefore part of the same species. Your argument is provocative, but not very logical.
Killing other Apes is not the same as killing humans, and trying to draw equivolence does your case no good. Much better to say that killing other animals is generally bad, as is destroying their habitat, or destruction of any kind.
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