Not surprisingly, the Serbs are presenting themselves as the victims. (Clinton equals Hitler, etc.) But it is grotesque to equate the casualties inflicted by the NATO bombing with the mayhem inflicted on hundreds of thousands of people in the last eight years by the Serb programs of ethnic cleansing.
Not all violence is equally reprehensible; not all wars are equally unjust.
No forceful response to the violence of a state against peoples who are nominally its own citizens? (Which is what most "wars" are today. Not wars between states.) The principal instances of mass violence in the world today are those committed by governments within their own legally recognized borders. Can we really say there is no response to this?

"Why Are We in Kosovo?", The New York Times (2 May 1999).