Guilt for the Holocaust is something that burdens all of the countries of the West. While Hitler oppressed Jews and other "undesirables," then mechanized and industrialized genocide, all of the countries of the West appeased him, stayed neutral, and, when war finally came, did nothing to try to destroy the infrastructure of the death camp system. Countries like Canada refused to hear the pleas of the Jews and gave no "refugee status" to the many thousands who might have escaped.
So when Iranian "students" mock the Holocaust and advocate genocide, I feel very angry and quite nauseous.
Iran wants to be treated as a civilized country. I don't see why it should be when, if freed from international constraints it would work toward another attempt at exterminating the Jews.
I can imagine how the elites of Europe and the Mideast would feel if some government encouraged or even tolerated groups that publicly or privately advocated the extermination of Muslims.