My dad used life is not fair as a means to justify how he wasn't fair to me.

Society -- the mechanism by which we human beings organize as a force multiplier against the elements -- is fair, or works towards fairness in order to encourage mutual cooperation.

And when we stop being fair, when we exploit or subvert society to serve the few, those elements, from heat or cold to famine to plague to predation, will be right there to divide us and wipe us out one by one.