>Congrats, you have learned the history of humanity and how our society functions, and your reward is you get to be angry at the vast amount of injustice.

I think you're imbuing your own value judgements into this. Many of us don't share the same urge to fix everything that's "wrong" with the world or society, and simply learn to accept it and roll with punches. But that still doesn't mean we're happier in life.