I believe "NTR hate" to be an internal joke in this whole "fandom". This whole porn-hentai-VN-RPGM-manga-furry universe is much based on depravity, "r*pe", tentacles, l*li, futa, besti, inc3s, alien, ponies, and all sorts of nastiness all from which "NTR" is the most mild or even the most "delicated" one. Delicated and sensitive in terms of development of the story and characters, if the plot is not well written the eventual NTR drop bomb in the story won't be effective at all, it won't cause any drama in the reader and it will be a failure. A simple and very common r*pe manga or novel is just that, just visual porn.
NTR goal is to generate drama in the heart of the viewer/reader. It's not about a forced body, but a forced heart. In any generic porn the element forced is the human body, in NTR the element under attack is Love it self. To achieve that level of understanding of love, emotions, and sexual desire, it is a form of art. NTR usually is the highest form of written art in the whole generic porn universe of garbage. So NTR is drama, and that's what it needs to be.
Among many others.
