I once mentioned to a newspaper editorial writer that opinions are only as good as the facts on which they’re based, to which the editorialist replied “That’s your opinion.” Happily, that opinion writer's take is not the standard we apply in the courtroom.
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This is what we tell juries about opinion testimony:
“The meaning and importance of any opinion are for you to decide. In evaluating the believability of an expert witness … consider [1] the expert’s knowledge, skill, experience, training, and education, [2] the reasons ...
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... the expert gave for any opinion, and [3] the facts or information on which the expert relied in reaching that opinion. … You may disregard any opinion that you find unbelievable, unreasonable, or unsupported by the evidence.”
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I’ve found it’s how I consider opinions in the rest of life too. Opinions that are unreasonable or unsupported by facts are just blather.

P.S. In my humble opinion, of course.
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