If articles could be distilled entirely down to titles, we wouldn't have articles. The authors are clearly not saying humans are incapable of rational thought, we're just not perfectly rational and in fact rational thinking can be surprisingly difficult for us, that's all. You know that, everybody who has read the article knows that whether they agree with the article or not, so why say this?
It's exactly this sort of hit and run straw man argument the article describes as being behind a lot of fallacious thinking. Scoring a 'hit' on an opponent, no matter how absurd or irrelevant, or how much it distorts the opponent's actual position, grants an immediate dopamine shot. It feels fantastic.
That's a really crucial part of the puzzle. It's why asking participants in a debate to first state the position of their opponent in their own words, but in terms their opponent accepts is accurate, before arguing against them is such a useful tool. It eliminates retorts based on knowing misrepresentations like this, which are a serious impediment to productive discourse.
