Prove that eating 3 meals daily is safe. A lot of diets tend to disagree. Should we prohibit people from having 3 meals per day because we don’t really know whenever it’s safe or not? Of course not.
Cars are useful, but not safe. By your logic, cars should be prohibited.
And what about alcohol? It has a link with sexual abuse of children, is not useful, and is not safe. Why you don’t advocate to prohibit it, instead of going after things that don’t have such link, at least to our current knowledge?
Australia bans both child sex dolls, regular dolls, lolicon arts, non erotic anime and manga, regular sex dolls, and even adult porn actors that “look too young”.
Japan doesn’t ban any of those things.
The result is, that Australia has 3000% more rapes than Japan. What more proofs do you need when you have such a drastic disparity between those two countries while seeing the opposite approaches to the topic of sexual crime prevention?