Where and when does it implied in the story that they're children? I'm sorry, but maybe I grew up in a different era, but in my country, 15 is already considered a young adult.
Right, Covid-19 made my business booming, so I think I'm doing fantastic. Thank you for your concern.
No, it's not. Because it's fiction, therefore it's not real. It's the same thing as to why most people are fine with dozen of movies and video games depicting gore, murder, violence, you-name-it, but not okay with the real-life version. But the question remains; just because it's fiction, does that mean anything goes? In my opinion, absolutely. Since time immemorial, as a form of literature, fiction has been used to tell stories of the impossible, stories that defies fact, concocted by imagination that is limited only by authors' creativity. It is a form of human ingenuity, and to limit such thing is the same as putting science on a leash. But then again; can one still find some work of fiction repulsive and dislike it? Most definitely, yes. Because not everything is for everyone. Most people understands this, except for a very few special individuals that can't seem to see the thick line which separates fiction and reality.
Sorry to burst your bubble, but the normal human reaction when they found something that they don't like would be to understand why they don't like it, come to term with themselves that they need to avoid those things, and moving on with their life. Because normal people couldn't be bothered with pixels fucking pixels.
Uh-huh, maybe instead of self-projecting try to construct a better argument lest you embarrass yourselves?