Julia Orwell +1000
I've been having those kinds of conversations with some of my closest (and trustful) jw friends, as well with my parents.
My conclusion is this: most people in general (at least in an under-educated society) lack the ability of critical thinking. I don't mean it's genetical. One can obtain critical thinking by going to the universtity or even by reading a lot by themselves. However, lack of critical thinking + average jw = lack of critical thinking ^ 2. One who has critical thinking, or at least tries to, is much easier to talk to and pose arguments. My jw friends that I CAN discuss those things with possess critical thinking up to a point, due to the fact that (a) they went to university and (b) they read TONS of books.
Not hard to see why the wts discourages (a) and (b) in particular.
As for the Neanderthals, yes they were a different species (although very close-related), plus they interbred a lot with Homo sapiens. Most with European ancestry for example, have an average of 2.7% of Neanderthal DNA in them. I know this is true for myself for sure, as I recently had my DNA sequenced, and yes it showed a 2.7% of Neanderhal DNA. Here's an anti-Bible evidence that flows inside our bodies! (hard to shake off that kind of evidence, huh?)