None of mentioned groups can stand against Syrian Army and it's allies .
Aleppo is about to fall and that will change everything in region . The main threat comes from the west and Turkey , Its possible that they try to enter the war to stop that . In this situation , A strategic Air defense system can be useful .
Turkey already started supporting terrorists with everything it has in order not to let Aleppo fall , the example is building and fixing the roads in north Aleppo , organizing terrorists in attacking Nuble and Zahra in north west of Aleppo and meanwhile opening a front in Jamiya Zahra to buy time .
Well i hope you are correct but these groups have taken half of Syria.
Turkey is a bit too powerful as of now for a depleted Syrian military to handle. At any rate some S-300's were bound for Hezbollah which can always use against IDF so one can understand ( and in your case blame) Israel's need for "neutralising" this threat.
Yeah Turkey has been a negative role since the start.
One might even say Turkey through NATO made Israel carry out the strikes?? Even though they hate each other as of now.
But you have to say Syria had it coming for buying these strategic weapons.