> I'd date these ancient genetic impulses away from the hunter-gatherers era to a more recent period where the violence made it possible to put hands on a big source of food produced by a new agriculture

I don't think evolution works that fast. Given the time-scales involved (as noted in my earlier response) most experts believe there's a greater genetic influence from the (vastly longer) Prehistory period than the Neolithic revolution (aka Agricultural Revolution), which occurred only 12,000 years ago.

> The hunter is not a warrior: they have a profound respect for the animal they kill and for other beings and among them for humans

While that's often the case, it's a bit too romantic for my tastes. Quoting Sapiens again:

It would be a mistake, however, to idealise the lives of these ancients. Though they lived better lives than most people in agricultural and industrial societies, their world could still be harsh and unforgiving ... modern foragers occasionally abandon and even kill old or disabled people who cannot keep up with the band ... when an old Ache woman became a burden to the rest of the band, one of the younger men would sneak behind her and kill her with an axe-blow to the head.