Cooperation per se doesn't result in pressure to evolve, unless it is cooperation against an outside competitor, see for example herd animals or the care of off

Cooperation per se doesn't result in pressure to evolve, unless it is cooperation against an outside competitor, see for example herd animals or the care of offspring. Hence the reasoning above that the human intelligence evolved in competition with something that required increased intelligence to overcome; the only such thing on the planet throughout human evolution is other hominids. Evidently, this is simply a hypothesis, and doesn't exclude other evolutionary pressures.