Asking, because my paternal ancestors happen to be Armenian from Khodorchur of Dayq province.
But that's the cause only of my irritation, while the weird feeling from reading your comment is because mass murders of whole peoples are not anything new in human history. It's just that Germany lost so conclusively in WWII that the winning powers decided to make it a crime - when judging Germany. Not Belgium, not UK, not France, not USA and USSR, of course, because these all had crimes of that kind on their sufficiently recent record.
One can speculate that Jewish holocaust made Europeans feel bad because it happened to rather European people. Or because it was committed by the losing side.
Or maybe, as with Baudrillard's simulacra, all Westerners care is what's portrayed as the evil of the day and the good of the day in their media. It's a kind of entertainment, and they don't care what the world really is.