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IIRC, raids of that kind didn't become common until about 15,000 years ago, a few thousand years before the Neolithic agricultural revolution. Tribal warfare doesn't date back to the dawn of modern man, which is closer to 45,000 years ago. There weren't enough humans to necessitate that level of competition because one could simply spread out to find more resources. Once real competition began, humans tried to adapt for survival, and one of those attempted methods of adaptation was a rather direct and violent form of competition.
The real threats going back well before civilization were starvation, illness, the elements, and predators. Assuming this return to our dawn thing could include steps to deal with each of these (which would make this incredibly complex), it might make more sense.
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