Being a pedo is a mental condition, just like being gay. You can't really change a sexual attraction that is innate.

Unless there are studies which correlate watching anime underage fantasies to actually acting on them irl, you really don't have a leg to stand on besides it's icky and offensive. You may as well preach that killing in video games causes mass shootings...

To be clear, I find it weird af but I am a stark supporter that media censorship if it's not hurting anyone is more abhorrent.