>>17642662D porn is worse than 3D because it isn't even based in the slightest of realities. You are creating a sexual fantasy land in your mind of things that will never exist and of people who cannot physically be real. Your mind is detaching itself from the real, albeit 'fake' world to the world of imagination.
There's only 'so far' real porn can go also. I'm sure you can find rape porn if you want (and go to prison by doing so), but hentai normalises such fucked up perceptions and views, especially of women and of sex in general, so much so that if say, a child, was raised all their life as just that for their porn, every person would be a rapist, if you know what I mean.
I'm not saying normal pornography is fine by any means, but people aren't going to stop any time soon, might as well give them something based on 'somewhat' reality than something that is completely detached from our own realities and human beings.