Against Psychological Plot Resolution

Since schizophrenics are unaware of their own psychological circumstance, it's high time that their pathology ceases to be exploited for convenient plot resolution in suspense/horror/thriller/mystery films. Unless such psychology is evident to the viewer from the beginning (e.g., Breaking The Waves) where the plot is about such dysfunction, a revelatory concluding twist is insulting to the type of dramatic realism which makes thrillers interesting in the first place.

In Stephen King's Secret Window, for a recent example, an otherwise compelling script is punctured and then deflated by a "surprising" yet by now altogether predictable and unsatisfying schizophrenia. What is the point of this? Is it at all suspenseful to find that cinema has been lying to us, that a character with every semblance of empiricism was the fantasy of another character? Hitchcock's Psycho, the popular genre's likely germ seed, takes severe pain not to give cinematic existence to Mrs. Bates. Contemporary audiences since the Usual Suspects have been prepared to suspect cinema's contents of dissimulation, and this is getting boring.