I think these "terrorists" are Kurds, fighting an oppressive Turkish government.
If others have specific knowledge, please enlighten us. I do not claim to know much about this.
That the Turks are oppressive doesn’t mean that the Kurds are angels. And even if the Kurdish desire for independence is justified, that didn’t mean that the PKK is not a bunch of terrorists.
You are on the right track.
The Kurds are not all on the same page as far as HOW to oppose the very forms of oppression from the government of Turkey.
There are members of a Kurdish political party that sits in the parliament of Turkey. They do not fight with the Kurdish organization, the PKK, which has militia camps in northern Iraq.
The PKK is also not well liked by the leading Kurdish political party in the Kurdish government of the Kurdish region/province of Iraq.
If all three of the Kurdish groups I just mentioned were sitting by themselves in a room, and were discussing the government of Turkey and its impacts on Kurds in general, they would be more in agreement than disagreement.
But, the PKK is the one that still fights while the others just lodge their complaints and wishes diplomatically.
Separate from all of that is the Kurdish group YPG and the Kurdish groups that have fended off ISIS and Turkey in northern Syria. The U.S., having worked with them against ISIS in Syria, is still providing assistance to them.
Kurds, as a distinct people, who have been a known people in the region since long before the Turks arrived, are divided by country boundaries that never provided self-determination for the Kurds. They are in most of eastern Turkey, northern Syria and Northern Iraq as well as part of Iran. They are neither Turks, nor Arabs, nor Persians, nor Assyrians. Yet they are ruled over by all of them.