A logical error

 I've heard some fishermen say that fish don't feel pain because if they did we would hear them scream. The error of this "logic" of this is clear. They don't have the biological apparatus to scream. They may well feel pain but it is not expressed in a way most people can understand.

I was thinking about this and then wondered what error(s) of logic I make in my own life,  behaviour, or thought.

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