Right, but the same applies to Russia too. Russia is pretending to bomb ISIS "terrorists" in Syria, and yet for every hundred bombing raids it's done only one has actually been against ISIS and ISIS territory. The other strikes have hit everything from al Qaeda off-shoots, which we'd probably agree is fair play, through to Kurds and Turkmenis who just want to be left the fuck alone in their particular pocket of Syria just because they also oppose Assad.
AFAIK the Russians never bombed the Kurds, Turkey however did, Turkey also closed the border for Kurds when Kobani was under ISIS attack. There is an interesting analysis about why ISIS survives. Short version: Because the Turks support them in many ways.