I actually do work in the arts, and have worked in programs that train high-potential, pre-professional teenagers in the arts! I mentioned my work as a child-minder on professional sets in an earlier comment, but I've held other positions too. So, a few thoughts.
1. Of course Lolita isn't meant to glamorize child molestation. But the novel is written in such a way that the reader can see Humbert as a sick and dangerous man, and Lolita as a child being taken advantage of. There's an actual social commentary there. Conversely, we had a camper on page two of this thread say that the photos were just supposed to be funny, and that there was no deeper meaning or message. I don't think we should retroactively assign some subversive, thought-provoking intent to photos that one of the people who was present for their creation says doesn't exist. Yes, of course art can be edgy or uncomfortable in the service of causing the audience to think deeply or reconsider previously held opinions. However, that latter part of my previous sentence has to actually exist during the creation process. If the intent is actually just "wouldn't this be funny?" then it does just look like cheap shock humor, which we shouldn't be encouraging from young artists.
2. I'm actually not clear what the creators' inspiration was. The camper on this thread said Y2K and Mean Girls, while the NG "apology" mentioned Sixteen Candles, Breakfast Club, Fast Times at Ridgemont High, etc. Those are actually pretty different eras of teenager aesthetics and categories of films! So which was it?
3. If this were actually happening at an art school, the students would be receiving training, critique, and guidance from trained professionals in the field. The camper on this thread said that they were getting minimal artistic guidance, and it certainly isn't apparent that the NG founders have the knowledge or experience to provide that mentorship to younger artists, particularly when exploring subversive topics.
4. No one is saying the artists shouldn't be allowed to take photos ever again. I really hope that if the kids involved want to make art, that they use this as a learning experience to refine their process and then keep working at their craft. They should! The NG founders are actually giving the kids a great opportunity to learn how not to engage with sensitive topics artistically and how not to deal with PR/communication with your intended audience.
5. This camp was sponsored by On. I'm sure On wanted to see creativity and fresh takes, but do we really think they expected the kids to tackle dark subject matter? If you want to have a career in the arts, part of that is understanding the intentions of the benefactors who are paying your bills.