Ah, so genocide is only wrong if your army had to travel by boat.
And lol, citing the Crusades as the first civilizational war. Yeah, sure, there was no civilization-ending conflicts before 1096 CE.
People in Asia were eradicating entire civilizations long before the Europeans learned to write. But I suppose that was okay, they mostly didn't need to use boats.
Hey, do you know why the Crusades happened in the first place? Super quick history lesson: Early Christianity was spread between five patriarchs, in the sees of Jerusalem, Antioch, Alexandria, Constantinople, and Rome. The Muslims invaded and overran all but Constantinople and Rome. They practiced forced conversions (as you know they are wont to do) and slaughtered Christian pilgrims that wanted to go to Jerusalem (again, as they are wont to do). The first Crusade (1096-1099) was decided to free Jerusalem from the Muslims so that Christians would be free to go on safe pilgrimage. The execution was bungled, but make no mistake -- it was not an unilateral action of Europe going "hey, let's be evil", it was a reaction to relentless Muslim aggression.