When Neanderthal man was first classified, he satisfied a felt need for a separate, intellectually inferior human species.
Obviously, each new find will change the picture of Neanderthal communities a bit, but there is no consistent evidence for them as an “other species.”
If new, separate human species are not found, perhaps they can be argued into existence.
Start by insisting that absolutely everything is a big accident.
Darwinian theory, by its very nature, demands this zealous emphasis on isolated, randomly generated characteristics or events — warring trivia, basically.