Since obviously morality isn't your thing, let's be pragmatic.
First, I assume you rage or else you wouldn't respond this way.
Second, I assume from this and your other responses that you rage in response to what you perceive to be a bad play by a team mate.
Third, I assume that you want to win the game.
I want you to now consider what happens when you rage at someone and then apply that to assumption 3. When you rage, the BEST case scenario is that the person mutes you and continues to play their game. In this situation, raging did absolutely nothing of value, except now hopefully you weren't planning on typing anything important since at least 1 person can't see it.
The most common result is that the person you raged at is going to respond negatively back at you, either by defending/explaining their action, raging back at you, or criticizing everything you do. People do not play better under these circumstances and in fact normally play worse. Moreover, there is more typing at each other which causes mistakes where instead of playing you are standing there typing.
Raging never helps you have a better chance of winning and usually makes you have a worse chance of winning. Therefore, no one should ever rage if they care about winning. So why do it? It doesn't matter who is sensitive or not, raging gives your team a worse chance of winning which is why I don't like my team mates doing it. We have 5 enemies to worry about, why are we fighting each other?