To admit that the leaders of Turkey of the past, were involved might call into question the legitimacy of Turkey today
The past leaders of many countries have been involved in genocides. Heck, current US Law is that racial interment is legal and the wars against the previous nations here are thoroughly documented.
But say that and most Americans will say, "what assholes" (or conversely "Happy Columbus Day!") but the scimitars will remain sheathed. I seems like an awful case of fragile identity. Weird jingoistic nonsense.
Then again, most Americans don't even care that the legitimacy of the governments are called into question every time they violate their operating agreements.