That's Not Fair! (But It's Just...)

 Habakkuk 1:12 Are you not from everlasting,
    O Lord my God, my Holy One?
    We shall not die.
O Lord, you have ordained them as a judgment,
    and you, O Rock, have established them for reproof.
13 You who are of purer eyes than to see evil
    and cannot look at wrong,
why do you idly look at traitors
    and remain silent when the wicked swallows up
    the man more righteous than he?

Habakkuk begins by coming to God asking Him how He can sit idly by and watch the evil and injustice all around him.  God answered. He is going to do something, using the Babylonians as His form of discipline against His people.  This made Habakkuk wish he had kept his mouth shut. This seemed unfair - that God would use and evil, even more wicked, pagan people to punish Judah. He sounds so familiar. We all so often call out "unfair", when that is not the real question. Is it just? Does God not have a right to do so? What if we always got what we really deserve?