That reasoning happens to apply just as well to any kind of mental slippage
Yup.
such as to scientists who think they can discover the truth about the past when all they have is their own imagination and speculations, plus peer pressure from others who share their theories, and no way of correcting them from the past itself.
Thank goodness few if any scientists operate that way. You forgot to mention hard evidence, observations, and measurements. Plus the peer pressure to get at the truth.