Sorry for the delay. Beginning of the month is generally errand/bill paying time for me, plus my group's kingmaker campaign is starting tomorrow, and I've been busy helping a new player finish their character. I'll try to keep my responses briefer that usual so I can catch up without
completely text-walling everyone to death.
First to clarify my question about "exclusive use": You claimed it takes 100x the land to support a hunter gatherer society, compared to an agrarian one. Are you saying that it requires
all the human-edible food in that territory to support the tribe? Or simply that it takes that much territory to feed the tribe in a
sustainable manner, leaving room for other species and regrowth? I'd love to see a source for this "100x" figure that offers some clarification.
Honestly, a lot of what you've said here contradicts what I've learned/been taught. That doesn't mean it's wrong, but it does require careful analysis.
Regarding cohabitation: Nature is full of examples of animals with common diets sharing overlapping territories. There may be conflict and competition, but you don't see, for example,
vultures going extinct due to the presence of lions in the African Savanna. Ditto for hyenas, wild dogs, cheetahs, leopards, etc. Generally an equilibrium is reached--even if it is a constantly shifting and adjusting one. It is only when something drastic disrupts this balance, such as a major climate shift, that some species are unable to adapt and major die-offs occur.
There also appear to be
numerous objections to the overkill hypothesis.
Leisure: My understanding is that primitive societies actually had
more leisure time prior to the development of agriculture.
Studies of modern hunter-gatherer tribes have apparently shown that they were able to meet their dietary needs with only 3-5 hours of work each day. In short, the notion of the hunter-gatherer lifestyle as a desperate, full-time struggle to survive is false.
In addition, such tribes have fewer material wants.
The drive to accumulate resources is a product of our society, which values wealth as a means to achieve domination over others. By contrast, hunter gatherer societies have been shown to value equality over stratified dominance, and actively work to maintain it. As a result, they have no interest in wealth beyond what is necessary to satisfy their immediate needs.
On the other hand, our society fosters an endless desire for wealth and power. It sets up an "arms race" where everybody has to constantly acquire more and more just to maintain their position. The result of this competition is poverty, suffering, and death for those who can't keep up. It might not be violence in the "punch you in the face" sense, but it kills more people than direct physical aggression.
Similarly, gangs are a product of government, not a symptom of it's absence. They don't operate outside the established order but embrace it--following the same pattern of aggression-based dominance. In fact, you could reasonably argue that governments are simply gangs that have risen to the top of the power structure. There's nothing inherently more legitimate about a government's claim to power. Like any group their authority it is dependent solely on their ability to enforce it.
As for the social contract, it is
inherently deceitful in statist societies. The government is saying "Let me be in charge, and I will protect you from aggression" but the very act of being in charge is a form of aggression. The basic premise is a con.