What portion of the scientists in the book are represented by Kahneman and Tversky? The other scientists in the book did not go to great lengths to avoid sampling bias. The authors could not be relied on to spot it either.

I don't see any point you made being bolstered. The anchoring effect you mention in another comment doesn't permit a scientist or statistician to throw their hands up in the air and say one mechanical turk group is as average as any other pseudo random group.