Turkish hostility towards Kurds can not be explained with PKK or YPG or other Kurdish freedom fighters. It goes back to Ataturk' plan of building nation state for Turks only. He tried to create it with Turkish minority and the Kurds were only nation/people who would not accept it

When Ataturk launched his racist Turkish nation state plan, Kurds have opposed this anti-democratic dictatorship and he started to deny Kurdish existence after S.Said rebellion (1925). Ottoman was not Turkish only but mix of all nations in Balkans, Caucasus, Mid east and Anatolia

Turks were minority in Anatolia, as Ataturk himself is not Turkish just as Hitler not having German blood. He called himself the god of new nation and oppressed all non Turkish muslim and non-muslim minorities. Muslim minorities accepted to convert by force by Kurds were natives.