In the human realm, everything is arbitrary ….
Think about it. Laws are arbitrary. Promotions and firings are arbitrary (Yeah, some you can see coming a mile away, but still …)
Success and failure don’t happen according to some immutable law of the universe. (John Lasseter would probably have been far less successful if he hadn't been let go from Disney.) ...
Definitions of beauty, good manners and personal hygiene morph from century to century and continent to continent. (Dukes and Earls in Louis XIV's court didn't take a lot of baths. We probably wouldn't like hanging out with them.)
And as for “fair” and “unfair”, those labels change with the public whim.
… And everything is temporary.
Nothing lasts forever. Not civilizations, not nations, certainly not you and me.