The logic is that they don’t want to incentivise people to make more kiddie porn. If it’s legal and lucrative, more people would abuse children in order to make the videos. Kinda like outlawing ivory because elephants are endangered; that elephant is already dead, but if ivory remains profitable more will be killed.

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I feel like the point isn't that it MUST have been used for knitting (even if it could have been), but that we should be open to more possibilities before defaulting to a religious explanation.