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Source: https://writers.stackexchange.com/a/35984
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

One way is to have the character's plans that were based on that logic to fall apart later. Also, if you show other examples of the character having flawed logic, then the reader is more likely to put it into that pattern. Another tactic is to have the flaw be over the top. While you can't guarantee that some readers will fall prey to Poe's law, the more flawed the character's logic is, the more likely it will be perceived as intended to be flawed.

What exactly are your motives? Do yo think the story works better if the reader knows the author knows the logic is flawed? Or is it just an ego thing, wanting the reader to know that _you_ don't think the logic is valid?

It sounds like you want the reader to attribute an in-universe explanation (the character's logic is flawed) rather that out-of-universe (the author couldn't come up with a better motivation). So make a valid in-universe explanation. Show what character-specific reason there are for believing in this logic. If the character believes the logic and you don't, why is that? What differences are there between you and the character? Is the character stressed? Limited worldview? Had previous experiences they're improperly generalizing? Less intelligent?

Original score: 10