Turkey IS ISIS!
ISIS is supported by Israel, the West, and the Arabs. Each support for their own national interests.
Israel benefits from ISIS incursion against the secular dictator. Plus, it makes the region more Islamist, which is good PR for Israel. Up until a certain point, Israel benefits from ISIS.
The West loves conflict in that region for a number of reasons, mostly economical and geopolitical. It feeds the military industrial complex from which we all benefit.
Finally, Arabs support their more Islamist brothers... they fear and support at the same time.
you may read this:
Izzat Ibrahim ad-Douri, Saddam Hussein’s long-time deputy, was reported dead (again) on April 17. An audio message on May 15 disproved this. Douri was the implementer of the Saddam regime’s Islamization program in its later years and a key architect of the insurgency after the regime was overthrown, which helped pave the way for the Islamic State (ISIS). ISIS has now turned on Douri and his associates, but ISIS could not have risen to its current stature without Douri’s help.
http://www.baghdadinvest.com/izzat-ad-douri-isis/