What she talks about at the end, filtering out information, is also called confirmation bias: you unintentionally, or intentionally, filter out information that contradicts your, oftentimes emotional, bias.
Summary: Rational thinking does not actually exist in humans (for the reasons, read the article).
Meta-Summary: So basing things on rational thinking, and excluding everything else can lead to false conclusions, because it's not possible for a human to actually do that. It's better to explicitly include the non-rational elements, so at least your confidence measure of a conclusion is accurate.
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