Being an antishipper fundamentally denies the existence of asexual people btw. If ace people exist and have sexual fantasies and masturbate (they do, if you think they don't you are ignorant of what asexuality is) and they do not want to engage in those activities in real life then its not hard to imagine a person who does not want to engage in their fantasies in real life and separates them from reality. Not even the only thing, a stark amount of people report having violent fantasies and the vast minority act upon it.
Before "Oh but its the romanticization of the fetishization of the sexualization of the normalization of" bs, that is a nothing opinion with genuinely zero weight. There are things that normalize ped0philic abuse, and it is not anime porn- if I had to guess its probably the fact that the leader of the most powerful country in the world is a fucking child sex abuser but what do I know! I mean, obviously because in movies and games they show things like animals talking, vampires, ghosts, murder, genocide, excessive drug use it means all those things are real and good and you should believe them all and do them all!
Much like a lot of arguments centered around "think of the children" it's not actually about the children, it's about making a select few people comfortable with what you do in your private circle in the internet. Antis will refuse to engage honestly with arguments in the vast majority of the time because being an anti for a prolonged period of time requires a general lack of thought on the subject or a lack of intellectual honesty.