This is such a complicated situation. The Kurds had actually pushed out Syrians from that region because they wanted to make it their homeland. The result was that there was mass flight - most of the migrants or illegal immigrants flooding Europe now are Syrians - and also that ISIS got a toe-hold by representing itself as the protector of the remaining Syrians.
All these groups are Muslims, of one variety or another, although many of the Kurds are Communists of a particularly severe stripe who have been attacking Turkey for years. They were also very hard on the few remaining Christian Syrians.
Turkey originally claimed that it wanted to clear the Kurds so that it could return the Syrian refugees to it. This was in response to increasing EU resistance to the Syrian refugees, and the demand that Turkey actually take all the refugees in its own territory. This was because most of them were passing through TUrkey to get to Europe and Turkey was thus the first country to which they should have applied for asylum and where they should have remained. Naturally, the Turks didnt want an infusion of thousands of Syrians.
Add to that historic animosities, Erdogans Islamic dictatorship aspirations, and - who knows whats going on over there? I think Trump was right to extricate us from this.
Yep, to me just the complexity alone is a big red flag.