I agree, but zero sum games exist within life as a whole.
I don't subscribe to the notion that there is no consciousness of others.
Machiavellians and other dark types in general wouldn't explicitly subscribe to that notion, but they seem to act as if it were the case, in the disregard for others, and sole focus on the self.
As an anology, suppose you're playing a video game. It's fine in that context for your character to go around slaying the NPCs, because they're just computer programs with either no or negligible consciousness. In that context, it's alright to win with no remorse for those slayings, because it really is just a game. And some people act in a similar way in real life, by screwing over other people who
do have feelings, and thus it is morally abhorrent.
Zero-sum games exist somewhat, but even in a competition, such as a game of sports, this is only zero-sum in some respects. The goal is for both teams and spectators to enjoy the game such that there is an overall benefit. So it is best to play in good spirits, and not get too ruthless in such a context.
Altruism is preferable to selfishness. From the perspective of other people, that is obvious, but if you consider divine justice, then it is even preferable for the self as well.
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Tying this back to the OP: Fi is linked with empathy, so it might seem that Te is remorseless and can operate in a heartless, zero-sum way. But really, there are noble ways to use Te, or any other function, and evil ways to use them. Fi is more humanistic than Te, but neither is inherently more moral in a global context, though Fi does think more in terms of right and wrong.
It is good for any type to have a healthy amount of any function, though yes it is possible for INTJ to overdo the Fi, and become
too Feeling oriented, at the expense of Thinking. In such a case, the INTJ may indeed mistype as INFJ, if the basis is on dichotomies rather than functions, though various other mistypes could occur as well. Going by functions, they may even mistype as an ISFP. The N>T>F>S order of preferences should be adhered to in general for an INTJ, because that leads to the best functioning overall.