I can see both sides of the argument but a very controversial subject

Man claims ‘child sex dolls’ will stop paedophiles from abusing children

You'd need a lot more research, probably decades worth, before you could say anything at all there.

So, the creator is a self confessed paedophile who has never acted on his impulses.

It strikes me that this would encourage like minded people to push their fantasies to a higher level i.e. more a catalyst than a prophylactic.