On the one hand:
SHOOT THEM THE FUCK DOWN IF THEY VIOLATE YOUR AIRSPACE (assuming you detect them at the time and have the capability)
On the other hand:
I bet Israel is counting on that so they can let everyone know they have evidence that IRAQ is actually HAMAS while they start bombing hospitals and schools.
I don't blame them for NOT shooting the fucks down. Rock and an explosive place backed by a global superpower...