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I don't believe this.
Hunter/gatherers had a lot of space.
They walked about and followed the game.
There are tribes that live on the food that women can find. Meat is a luxury. Men go out to hunt.. As an extra.
The moment when people started as farmers, that had as an immediate consequence they had to protect their crops by defending the area.
So agriculture made a military presence necessary.
Agriculture also made it necessary to build stocks in well defended areas, that became cities.
So, the cities, and agriculture, together with the military organization meant much more wars, than the hunter/gatherers must have known.
Although an attack on a small group of people must have been more devastating for human DNA distribution. Some DNA groups might be wiped out in a short time.
We call that genocide nowadays.