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There are degrees of introversion/extroversion as well.

Many of them could, in fact, stop being vocal. They did not have an incentive to. They had an incentive to be/become vocal.

That's the fundamental issue which has very little to do with extraversion. The world rewards loudness, and most attempts at making the world slower and more silent are actively thwarted.

Too much "squeaky wheel gets the grease"; not enough "the nail that sticks up gets hammered down".

Of course there is no us and them

But them they do not think the same