I think it's very easy to say "if you know you've earnt yr own belt, why do you care if someone else passes easy or progresses more rapidly than you?" I actually think it's quite a challenging thing to accept things "as they are", especially if there is a perceived injustice involved. It's also quite daunting to gain a new perspective on what those belts mean to us... after all, sooner or later we all have to uncouple our training goals from an external reward/recognition system. In a way, i reckon getting beyond the various meanings of yr belt is almost like a "beltless test"... where only you can decide whether you've passed or not.
Yes, but this is a lesson most juniors must learn.
There will always be someone better and then you get discouraged and quite.
There will always be someone worse, then you get big headed and your seniors need to take care of this (the nail that sticks out gets pounded in)
Most blackblets learn the lesson that "What is better?"
If you and I are both promoted to Il Dan at the same time, and you can kick faster than me, and I can spar better than you, and you can do patterns better than me, and I can break better than you, and you can teach better than me....
Then who is better?
This is why MMA is a joke to Martial Artists as it is mearly a small part of the Martial Arts, tested under certain rules. No more a test than a show. What if we both wrote out our names, and then decided who courld write better (novels, dissertations...) based on this one little thing.
I grant you there are perceived injustices, and there may even be injustices, but there is no black and white. It is not, and has never been up to a student whom else an instructor promotes and why. Most of the times this is mearly projecting a situation on yourself, that you really know nothing about.
You let the situation controll you.
I could easly show you why this student is letting the situation controll him.
What if, after complaining, that life is not fair to the instructor, the instructor told you that this student had 3 months to live because they had cancer so that is what his decision was made on.
A) It is none of your business as a student.
B) You would feel like an idiot because you let the situation controll you instead of you controlling you.
This is a hypothetical but it goes to show that you are not the instructor and do not know the reasons why the decision is made.
Only with expectations come disapointments.