Going to just pick one part here to take up which is the Rousseauian notion that agriculture leads to land ownership which leads to warfare.
If that were true, we'd expect non-agricultural societies (hunter gatherers especially) to be relatively peaceful.
Instead, they're hyper-militarized. 1/
"Online Rent-a-Sage" Bret Devereaux
A different take on that statement from an archaeologist 💯💯💯🎯