Guys who have rape fetishes are powerless and weak. They're so worthless as mates that they understand that any attempt to signal their desirability is doomed to fail. Their only chance is to force themselves on women, or use other methods to coerce them into reproduction. It's the cry of a walking genetic failure who needs to have his entire lineage die with him.
Unsurprisingly, many men are biologically unfit, and shouldn't be allowed to reproduce.
Porn is rape on tape. If a husband or boyfriend loves it, and the realization that it's rape hasn't made his stomach turn at the very idea of it, it's not just him being an empathy-lacking coomer, it's him secretly knowing and accepting that he is biologically worthless, and he's just lucky enough to have fooled you into thinking he isn't.