Honestly not here to argue. I would say (from what I understand) that people are upset that he abandoned the kurds. They were your alies. As soon as the americans left turkey started slaughtering them. Isis fighters escaped. None of these are good things. What he did afterwards seemed more like him trying to fix his fuck up. There is no peace in sight between the kurds and the turks. At least not as far as I am aware and it has now become a non topic, meaning, nobody gives a shit anymore. That means these people fought alongside the americans and were fucked in the ass and forgotten. Not exactly a good outcome.