Behaviour
Confirmation bias
Seeking and believing information that supports what you already think.
How it works
Once a position is held, contrary evidence gets scrutinised harshly and supporting evidence accepted easily. The portfolio starts editing the research.
The practical defence is to write down in advance what would make you wrong, and to seek out the strongest opposing case rather than the weakest.
Where it misleads people
Social feeds amplify this structurally. Following people who agree with you produces a stream of apparent confirmation that is really an echo of your own view.
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