You are focusing on the 0.01% of humanity which isn't part of mainstream modernity rather than the 99.99% which is. And you're discussing cases of extreme differential in technological knowledge and worldview (Amazon jungle, Papua New Guinea), rather than the vastly more common smaller gaps and asymmetries.
If a majority of adaptations happened with force, how do you explain the ones that didn't? Don't they suggest that even without any force there would have been convergence, just more slowly?
European settlers committed genocide against the native peoples of North America. I'm not denying that. But that happened in a context of a 400 year process of cultural exchanges and mergers in both directions. Arguably North Americans could not have ignored the written word or manufactured textiles in perpetuity, just as their societies adapted and mutated to accept the horse and steel tools.