@b870d4c8 I was asking the same thing here. And forcing other Arabic countries to engage might be the answer. I don't have any doubt that the retaliation will be horrible and will hurt other countries like Lebanon and Jordan - more than half of the population in Jordan is Palestine & the country keeps the neutrality in the conflict. Lebanon has Hezbollah and Iranian support, but the population is too traumatized by the last conflicts. The popular pressure to engage will come first from Jordan. 

 @b3985c34 yes, so far the idea of forcing Arab and Muslim countries to choose sides seems like the most plausible explanation.