They left Turkey because the are Kemalists - separation of church and state types, unlike the current Erdogan government.
Erdogan has visions of a reborn Ottoman Caliphate. The last one ended as the out of place and time Sick Man of Europe, defeated by a rabble of Bedouin savages, an antiquities/philology professor, and a small sampling of British mechanized might. This one might die in a wave of Russian radioactive fire if he’s not extremely careful.