Bro how can I put it without explaining 100 years of history, the cultural difference, Kurds are mainly Sunnis but are not Arab, Kurds aren't really into religion as much as the Arabs ( but mind you you get your fanatics here and there) Truth is Kurds have been suppressed for decades, they were thrown into a mess Ever since the Sykes picot agreement, which I believe was a 99 year deal, and due to expire next year and the Kurds will launch their independence with the UN I believe.
i know I didn't give you an answer and it is quite impossible to explain in a post or two.
while you're doing research check out the Sykes picot borders, and how Kurds were decided between Iran, Iraq, Syria and turkey , another thing is Kurds won't accept an Arab leader as there is no connection to the race, also have their own government/parliament/militia the only thing the two races share is the currency and passport, mind you all the Christians, yazidis and Arabs fled their towns from Isis and the Kurds welcomed them all in and provided safety. And now that Isis is under control (at least from the Kurds point of view) the Shias are now jumping up and Down threatening the Kurds for the land they protected while they (Shia militia) ran away. And the Kurds aren't having it and so on and so on.... This is current events.. You should do your Own research and tell me your thoughts.