Comment: You have picked one example

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In reply to comment: Irrationality is not an "opinion" (see in situ)

You have picked one example

which is highly contrasted by definition, to argue the validity of a position on a subject which ranges from hard physical objectivity through to purely sentimental expression.

You could argue that everything a person does which does not directly benefit the health of our bodies is irrational. What is irrationality ?
How can you define it when everyone has their own values ?

And if you would quickly point to the "facts" of science etc... the facts of science are actually incredibly transient and objective if you truly study them. If you want to understand why I would suggest such a thing, then I would recommend listening to this guy with an open mind.
https://www.youtube.com/watch?v=0waMBY3qEA4

Freedom is a byproduct of acceptance - judge not.