This is only one side of the phenomenon: you have antis demanding that fanon content educate people, then that adults in fandoms take care and protect children, and what does it all tell you?
These teenagers are being left alone on the internet and are projecting the parenting they’re either not receiving or are not receiving as they need on perfect strangers on the web. They legit believe that they can make the internet space they like safe by demanding that the adults in it become their surrogate parents.
Sorry, random teenager on the internet, I’m not your parent, I’m not your teacher, and nobody owes you anything. Fandom is not a safe space. Internet is not a safe space.