The degree to which resources are scarce and contested varies geographically yes. Around me there is not a constraint on the deer population, resources are ple

The degree to which resources are scarce and contested varies geographically yes. Around me there is not a constraint on the deer population, resources are plentiful for them and outside of hunting season there is little contesting the deer. Eventually the deer population grows enough that the lifeforms they share space with decide to, mm, contest their expansion, but there are places and periods in which populations can grow unconstrained for a while. I suppose I was making the point that humans maintaining a certain way of life for tens of thousands of years may have lived in a way where resources and rival tribes were not an issue, and hence, had little motivation to develop defensive weaponry / collect starvation rations for rainy days.