I fail to see the distinction. Humans moved out of africa in waves. Neanderthal was one wave, homo sapien was another.
Neanderthal died out in europe, evolved into homo sapien in africa.
You *could* say that neanderthal "evolved" in europe and therfore "weren't related - but they just maintained the same functions over millenia. Homo Sapien added functionality.
How else would I state the evolutionary steps?
The many names of pre-humans make "Neanderthal" easier.
The difference in behavior is in the polular culture.
God point though
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There are no absolute truths, only well established ones.
"Truth" is the best logic that fits the available evidence.
Logic is derived from the structure and iterative nature of the universe.
Gather evidence, apply logic, argue until agreement and that defines the "truth", for now.
If you don't agree, gather more evidence, strengthen your logical arguments.
This is the first tenet of the House of Logic.