It does not matter whether such behavior is absolutely required for survival in any possible imaginable circumstances. Given such intelligence, human survival becomes a function of behavior. Further, behavior can be, and is, a part of culture. It is a modification of fig. The change to a partially carnivorous diet had extremely broad implications for the social organization of early hominoids.
Carnivores get a large supply of calories at each kill.
And the amount of information which needs to be transduced in a communication system for plant eaters like the gibbons is small compared to that needed in group- hunting of large animals. The general pattern of the human brain is very similar to that of ape or monkey. Its uniqueness lies in its large size and in the particular areas which are enlarged. From the immediate point of view, this human brain makes culture possible. From the evolutionary point of view, it is culture which creates the human brain.