there are no hard facts, unless you can provide pics and vids of Turkey actively helping IS. there are tons of authors out there who write various kinds of BS just to please a certain audience, but i haven't seen a single solid proof. NYT recently finally used a picture of Erdogan and Davutoglu visiting a mosque associated with IS, which unfortunately seemed to be false, so NYT corrected it and apologized. Turkish media used pictures of Erdogan's son with IS members in Istanbul, turns out they are local restaurant owners. Sure Turkey gave IS indirect strength through helping FSA, some of which switched to IS, or could have done more to arrest IS members or controlling the border more strictly, but accusations like 'Turkey created IS' is just BS and used to push Turkey into a corner by certain folks who are annoyed by Turkey. of course you can have your opinion.