Good posts, Aaron and PD. But I think it is false to attribute all, or even most, wars to “scarcity”. In historical times, raiding other tribes to take their women was not due to shortages of same at home, e.g. And those pushing for a Global Ummah are not deprived of anything much except willingness to tolerate any rule or regime or religion except their own.
Neither Hitler nor Genghis Khan were noticeably deprived, nor were their subjects.
There is only one way to resist such tyrannies and ambitions. If you want peace, prepare (well) for war.
OTOH, I do have hopes that the near universal wealth and surplus energy and prosperity which FF can deliver will distract wannabe despots from adventurism, and enable their prospective victims to defend themselves competently.