I agree, to the artist there's a story. I don't draw anymore but generally if I drew a scene I had a story in mind. Unfortunately I think the problem is that LJ can't judge a story they can't see. A series of drawings might be seen differently.
I wish I still had links but I don't. But I see the artists view on it, but I also see LJ's view.
Honestly for the most part I think both sides are at fault. LJ has handled it badly. Warnings should've been given since it's a new rule. But on the other hand, the two artists should've exercised some caution with their posts since the climate is what it is at the moment. I did see one of the images and it was graphic and while Harry didn't look underage, he was in school robes and it appeared to be at Hogwarts so it heavily implied underage.