Exactly. It's the same with all the Jump mangas and their anime adaptations. You can claim they're "mature" and more "mainstream" than Western Science Fiction 'til you're blue in the face, but you're holding the minority view in society. Even the companies that make the shows and comics in Japan don't see their products as "mature". Not to say that there isn't manga aimed at adults, but I'd say it holds a similar stigma that "adult" comics hold here, namely that they're not as "adult" as they claim to be.
And yes, I am a dork. But I've come to terms with that, I suppose.