As a guy who can enjoy NTR depending on context, mostly in cases of female MCs and other specific contexts, but who despises Hunter type of NTR, I believe I understand where the people who condenm the bad endings are coming from.
It's a simple question of being able to separate the canon/non-canon stuff. I can watch the bad endings, then revert time or the save and go on with the game, without bitching about it. I have to assume everyone here is able to do that separation, otherwise I recommend medical help, at the end of the day, they are both fiction, in a game. Now that said, the other complaint about NTR is the whole "grinding" the MC goes through, in contrast to the quick and easy results Hunter gets. I gotta say that does bug me a bit as well, feeling like the MC is missing out, but then again, non-canon timeline, so whatever. The whole point of the story is the MC is building a relationship with all the girls, while trying to get rid of Hunter, using his power over their financial life to drug them and whatnot. I can recall a moment where the MC wonders if he should go do something to one of the girls while she is asleep, just to shrug it off as a joke, poking fun at games with forced sex and all, these for me make it clear why Hunter "sees more action" so easily in the NON-CANON bad endings, he drugs and abuses them, while MC is an actual decent human being. I can enjoy games where MC is not such a nice guy too, but this is not one of them, anyone who complains about content in a game, surely you can find what you are looking for in a different title in the site.
The bad endings are basically glorified GAME OVER screens, with a little sauce on top for those who like NTR/ to provoke those who don't, to motivate you in the competition against Hunter, another key part of the story. I don't see anyone crying because Mario fell into a pit of lava and the game rewinds back before shit went wrong, ya'll just gotta chill and enjoy the part of the game you do enjoy, or if that's not working, leave your 2 cents on the matter and move on to find something that pleases you.