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To be fair, that was back when wildlife was much more of a threat. And probably also a lot more risk of criminals or other bandits. Making a weapon to protect your tribe is not really in the same ball park as this.
I see your point, but I would argue that in a world with nuclear weapons, climate change, and all sorts of shit that seems to be an existential risk, plus the media barrage, people today aren't exactly feeling safe or comfortable. Hence the desperate hoarding of resources and brutal competition.