Because the 49 hostages was a one-off?
Because they are now being attacked by NATO anyway?
Because the guys they are not really attacking Turkey, but just "passing through"?
...and wot Tash said. The Kurds are effectively gaining sovereignty everywhere else, and Turkey would exterminate them given half a chance, and ISIS doing it for them is way more than half a chance. The SP guns Turkey sent probably already had PKK sites programmed in.....