The mutability and denigration of hero cum anti-hero is about as common as the reduction of rape to mere shock factor. Just as the anti-hero or 'psycho' character never really is psycho, much less orthogonal to the virtues of heroism, so likewise 'rape' is detached of its actual effectualization. These things exist for sake of existing. No heroine is ever raped, no psycho is ever psychopathic. However, wherever an exception to the contrary is found, so likewise its other, meaning if you want to read a story with a real psycho, your luck's looking good getting them in WN/manga where heroines are actually raped, or some sex transpires. It comes in pairs.
So basically, where there's smoke there's fire, and where there's rape they're psychos.

For instance, Overlord.
This is how you enjoy isekai.
Patternize.