Science is done on IQ and some conclude that differences in IQ scores matter. On the individual level, for groups/societies and their IQ averages, how it is distributed withing groups. Also ethnic groups show different average scores.
IQ tests measure different cognitive skills though. And then there is nature-nurture; how much of an IQ score is the result of relatively unalterable conditions like genes, how much does the environment via culture, food, education etc impact a score? And me supposes that although IQ may matter, it does so probably less than often assumed since there are more variables at work. A society is a complex as the climate and to isolate just one variable and blame-fame all that goes bad or well on it doesn't make much sense. C02 comes to mind.
Some people conclude that a lower average IQ of any society is not good for that society and can explain a lot of the poverty, crime rate and so on. The higher the average IQ score, the better it is for everybody. A good example of this viewpoint is Stefan Molineux who did a series of interviews on his youtube channel. On Dave Rubin's channel he was interviewed about it:
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Just had a heated discussion with my wife, in her opinion the IQ test itself is racist. From the time that European scientists started to measure skull sizes in Africa etc. This territory shall be treated with caution.
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