Of course they'd sputter, it is a silly statement. Take a look at your morality: was it moral just because your ancestors were on the invading side? What justification do you propose for such a naked land grab? Even if you think that the Byzantines had some how more of a "right" to that land than the Turks, that only takes you as far as the Fourth Crusade... when the Crusaders sacked their ally because it was less work!
Hell, that reason doesn't even take you very far through the First Crusade. So really, tell me, how were the Crusades just? No one gained any freedoms, freedom of religion actually became much less, none of the crusader states made any lasting mark on history, an enmity was created that still lives today, and a lot of people died who did not need to. That's pretty much an unjust war if I've ever heard one.