First there is some contention in this and I'm basically reflecting Toobys opinion here. He says that there was no selection pressure to develop general intelligence and instead we have specialized subsystems that help us navigate our world.

IIRC the video was the following:John Tooby: Can discovering the design principles governing natural intelligence unleash breakthroughs in AI?

As evidence consider the Wason selection task, although a very simple logic puzzle most people fail at it, but can do it when the same problem is presented in a social context instead.