That's a tough one, I guess. But it is just fiction, not reality in that sense; writing and reading about this isn't the same as doing it or personally endorsing it. Or all the people who wrote crime novels and horror stories were endorsing crime and violence. Which they probably weren't - they were just writing stories. And all the people who enjoyed them were just enjoying them.
If I were asked in an intelligent world should people be allowed to entertain themselves with fantasies, however much I did or didn't agree with them, I'd say yeah, because it's the mark of an intelligent mind to be able to "entertain" or explore a thought without actually agreeing with it. I'd only say there would be a "problem" if this fiction were used to justify an equivalent in actual reality~ if it normalized this behavior, when I suspect it's more the other way around.
I mean, I write dark stuff myself. In these stories people get coerced, attacked, manipulated; I don't agree with these things or think they are great, but they're part of a story I want to tell. If someone came along and said "you shouldn't write that because a) I personally think it's wrong or b) it's a potential bad influence on people, I'd have to tell them to grow up and understand that it's okay to do this in fiction and that free speech is a good thing. If everyone was fully aware it was fiction, and that they shouldn't be using it as some kind of guide in life, I don't see a problem there.
But yeah, the guy will often get away with a lot if he happens to be a looker and not an old lech. I suppose this may well be tapping into fantasy/fetish stuff that the writers or audience like... and it's something of an unfortunate fact that if somebody is handsome or pretty IRL they have an immediate advantage over people who aren't and this is a part of that aspect of the human pysche. Just look at all the Edward or Loki fans out there... it doesn't seem to matter so much what he does as long as he's hawt. But I also do think most people understand this is not reality, so they don't feel like they're endorsing this behavior in real life. I wouldn't say they are, either.