Interesting and informative post. The sad thing about the history of human civilization is the corroboration that we have always been conflict-driven. I guess that's pretty much the case with most living organism, including other animals and even plants (the competition for the goodies of the ecosystem to the point of extinguishing the competition).
I don't know why we keep conceiving the possibility of peaceful coexistence. I guess it can be achieved at some level, even if for temporary periods.
With so much scientific proof of shared origins, people should stop cultivating superiority complexes.