Life is fair. to paraphrase that one movie "everything in nature tries to find a natural equilibrium with the surrounding environment", like how water tries to find it's level. the thing that makes life seem unfair are the actions of people who try to pervert this natural equality but fucking over their fellow man.
so Life is fair, people are not.
to quote that other movie
"i always thought life was what we make of it."
and in that line of reasoning i have always felt that we should strive to be fair and make the world a better, fairer place than give up and tote the line that somehow existence is naturally unfair (which is usually what is given as an explanation by those who are fucking you over to justify their actions).