Go to response #1 above and check out those articles. That’s the main thrust of current responsible research into Neanderthals.
"The fact that Neanderthals could adapt to new conditions and innovate shows they are culturally similar to us," [anthropologist Julien Riel-Salvatore] said. "Biologically they are also similar. I believe they were a subspecies of human but not a different species."
From the third article:
"He added that they were also similar biologically, and should be considered a subspecies of human rather than a different species."
From the fifth article:
"The big question, according to Cabanes, is how such a resourceful species went extinct."
I'm not seeing anything there to back up your contention.