On a tangential but mostly unrelated note, one of the easiest ways to detect biased opinions is to see how they change over time. Opinions based on evidence will get updated as new information comes to light. They might become more complete as blanks are filled in from unknowns, they might add arguments or nuance based on new information, or they might trim out parts that were previously speculated but weren't borne out by the data.
When someone's opinion is completely unchanged by new information, it either means the original opinion was perfect from its inception (this is a rare enough occurrence that it can be set aside in practice for most complex topics) or that they aren't listening to new information and have pre-determined their opinion to be correct.
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