Balance is when there's an equal amount of two (or more) contradicting things (in our case, the dark and light sides of the force). There was no balance before ep3 because there was an excess of jedi and the lightside, only two sith and a bunch of non-sith darksiders. Then Anakin turned to the darkside and began killing off the excess jedi, bringing a relative balance. Then came Luke, brought Anakin back to the lightside, and killed Palpatine, again breaking the balance in favor of the lightside\ jedi. The cops are fighting crime, not war. Your argument is invalid. Some could of course argue that war is a crime in itself, but that's a matter of rhetoric.