I think this move has parallels of how Sikhs were abandoned after WW2 to face partition. What do you think? It does clearly demonstrate realpolitik to me, where minorities can be swiftly abandoned by western 'allies' after being used in military operations, after a threat is considered to be removed.
https://www.dailymail.co.uk/debate/article-7552375/MACER-GIFFORD-former-British-volunteer-Syrian-Democratic-Forces-slams-President.html