As if IQ is the only or the most important factor that can dictate whether someone will have a happy and prosperous life.
the driver of adaptation, survival and progressive development of the species [and its civilization if any] are not necessarily the ones who live happy and prosperous life.
30+ years ago China made a choice between 2 alternatives - "1B population with IQ 135" or "2B population where 1B has IQ 130 and 1B has IQ 120" (the specific values 135/130/120 are just for illustration)