Apparently in discussing the Holocaust, some of the Nazis told Hitler that this would bring a shitload of disgrace down on their heads, that they'd be universally regarded as inhuman monsters forever, and Hitler's answer was something like, "Bah! Who now remembers the Armenians?" Meaning that the Armenian massacres raised a huge stink for a few years and then blew over, so the Germans could expect to exterminate the Jews without having to pay much of a price for it.
The Turks are very sensitive to charges of genocide and resent being labeled as the perpetrators of the world's first genocide. When motions were presented to various parliaments around the world calling for condemnation of this particular genocide, the Israelis decided against acknowledging that the massacre of the Armenians was genocide, for fear of alienating their Turkish "ally."