IQ scores in most of the Western world began reversing sometime from the 90s to early 00s. [1] That link is for the US but similar stuff has also been observed in most of every Western/OECD nation. By contrast they're still rapidly increasing in the 'Global South'. You'd expect this to manifest in reduced test scores and reduced quality of outcomes across a breadth of fields over time paired with the inverse happenin…
I'm sure you fail to see the contradiction in claiming that "rational discussion" is a taboo while clearly not stating your hypothesis.
In the same vein, your hypothesis obviates the fact that "rational discussion" in topics of interpreting social studies requires building out on a ton of assumptions that are weakly held and the reason why the social scientists abstain from giving clear-cut answers is because the topic has too much depth and nuance to make strong statements with confidence.