I think you’re missing the point of the -porn suffix. Its not supposed to convey “the study of” or “images of”. Its meant to convey that viewing it is satisfying in some primitive/emotional/aesthetic way. NaturePorn isn’t just “pictures of nature”, it’s “pictures of nature that suck me in and make me want to see more”. In that regard, the comparison to sex is intentional.
Book burnings are bad when they are used to prevent the free sharing of information or ideas. It is a form of censorship. Burning the Quran is not censorship, because this is not an attempt to ban the Quran or prevent anyone from reading it. Its an entirely symbolic gesture. Its comparable to burning the American flag, which I’m guessing you’re not so against.