Anime / Manga - "fictional children are just like real children"

And than we've the same complainer(s) fetishizing shonen-ai on boys at the same age.

Because double standard.

Because once you've comitted the error of caring about fictional children, you inevitably is going to slip "it doesn't matter if she talks, acts and looks like a 40 year old, her assigned age is 15 so lewding her is child pornography". Slippery slope isn't a fallacy, people who say that are lying.