It bugs me when people say “life isn’t fair.”
For one, it’s a disempowering belief. It encourages people to act as victims, or to view life as capricious. It’s much more productive to see yourself as empowered (at least to some extent).
For another, it can’t be true. If we take the definition of fair to be “that which is consistent with rules or logic,” and the definition of life to be “the physical and mental experiences that constitute existence,” then life has to be perfectly fair, by definition. It’s a matter of physics. The Universe operates with certain rules. You are a part of the Universe, and therefore bound by its rules. Now, you might say that it’s unfair that no one gave you all the rules, and even if they had, there’s no way you could possibly
understand all of them. However, working with incomplete information is one of the rules. It certainly makes the whole endeavor more difficult, but not unfair.
I think it would be better if people said “I didn’t get the outcome I wanted, and that’s because I don’t understand the rules yet.” Then, at least, you’re in the student’s mindset, and there’s the hope of improvement.