> If you believe, as I do, that such a person is guilty of a crime,
You just explicitly said upthread that ethically they are not, but argued that it is useful for them to be treated as criminals because it denies an excuse to those who are ethically guilty because they are possessors of genuine CSAM.
You seem to be moving your fundamental ethical premises around in response to it being pointed out that the argument you previously made conflicts with a different widely proclaimed ethical premise.