There is no phrase in the english language that irks me like that phrase, "It's not fair." Actually that isn't true, "That's not fair," is equally irksome. 

Feeling analog- I pulled out my edition of the Webster's Pocket Dictionary (which wouldn't fit in any pocket...except for maybe the jenko's I owned in the 90's...but that's another story). 

And you know what? It only had the noun version of the definition. "An exhibit and sale of things often for charity." 

Well that's not what I was looking for. Guess we'll have to turn to our digital dictionary friends. The first definition that pops up on the Google search defines fair as this:

"In accordance with the rules and standards; legitimate." 

All I hear, when I the words "It's not fair" are uttered is "It's not fair that this situation isn't going according to the rules I have set up in my own personal narrative." 

To be clear. "It's not fair," and "It's not just," are two very different things. Systematic persecution is unjust. Manipulating people and praying on their fears is immoral. You not getting the toy you want is...life. Life is not fair which is why we strive to be just and moral.