What i don't like in your explanation, is that it's more about "real life" than games. most ntr games are not about being in competition, failure, or drama. it's more often about cheat, rape, corruption.
While it's great for some people and i agree that it can be really good in a story, you have to admit that most games add it just to have someone fucking someone else and nothing else, no story or anything.
And you can't blame people for being against some things. we're perverts, not machine without values or moral.
As for the other guy that say that being too much into a game is wrong... maann.. that's quite the objective of any history, making the player/reader feeling something for the protagonist (hate, love, comprehension etc...) even if i do agree that some people react too much.
Ok that is a cool post - finaly someone deals with arguments.
And ofc you are true that a lot of NTR in games is just to have more sex scenes, but thats how it is with the games in general.
90% of the games are stupid mindless fuckfests anyway.
And for such games cheating, rape, corruption is good way to have as many scenes as possible.
But when you talk about morals - I'd assume you are talking about diffrent rarer kind of games, that actualy are about relationship building etc. And I understand your point.
I personaly dont find many games out there that I can emotionaly get into beeing the protagonist.
The games are eighter too silly, or they are designed in a way that you cant realy get behind the hero.
But even such games when you can get immersed with benefit from small doses of the drama that slight uncomfortable scenes can provide. I am always in favour of any real NTR to be optional in this games, but there is no problem if the same game has an optional path - where you fail to keep the girl with you, and she falls with the other guy.
Thats entirely up to author then.
So in the end it is simple - if the game main design is to have NTR - there is nothing you can do about.
But if the game is designed to have love route, it is good if actual NTR is compleatly avoidable.
Seeing your Love intrests flirt with another dude, having a nightmare without actual sex or defending your girl from beeing sexualy assaulted ARE NOT REAL NTR, they are just plot points that player has to deal with in realistic game scenarios.