The israelis can do what they want but they will go it alone. They are attacking a sovereign country that has Absolutely not attacked them. So good luck with that.
Israel could spark WWIII if they keep this up.
There is little basis to dispute that Hamas and Hezbollah, the Iranian proxy terror groups, have used Syria (with the consent of Assad) as a base to attack Israel.
There is also little dispute for me that Iran, acting behind the scenes, bears much responsibility for our casualties in Iraq. Iran supplied material and financial support to the IED campaign. Period.
The problem for Israel is Iran. The problem for us in Iraq has been and will continue to be Iran.
Israel has every right to attack Syria because Syria has by silent consent and cooperation with Iran facilitated attacks on Israel. Frankly, I would have cheered loudly if Bush or Obama had leveled some military facility in Iran every time an IED killed or maimed our soldiers in Iraq. Israel wears big boy pants and if they choose to attack targets in Syria they will live with the consequences, but I do not think the situation is as simple as you make it out to be.