Not to discourage other answers but I have a very long answer to a similar question here:
This doesn’t directly answer your question but the oppression of the Kurds is deeply tied to nationalism, and the Kurds lacking their own nation state while “not fitting in” with the image the governments of the states that actually control Kurdish-majority states. Even in Iran, the state in the region that is most accommodating to minority ethnic groups (Persians only make up about 50-60% of the population, with Azeris making about 15-25%, Kurds making up about 10-15%, etc), Kurds tend to be Sunni in a Shi’a majority state that is less tolerant of religious difference.