Pop Science Shouldn't Quote Real Science

This is one of the most important things I can share with you. Why is it so hard to be happy? Because life was mostly short, brutal, and highly competitive over the two hundred thousand years our species has existed on this planet. And our brains are trained for this short, brutal, and highly competitive world. (Location 332)

Least scientific psycho-pop drivel. Sometimes unverifiable statements like this upset me as a reader. Taking a grain of a truth and expanding on it casually does not make the follow true.