They're planning for a devastating, multi-pronged war on Iran's nuclear facilities and communications with no guarantee of informing the US in advance, according to Eli Lake's reporting. Israel would, in other words, pour gasoline on a Jihadist fire that would spread across the West and then ask for understanding:
One American close to the current prime minister said, “When Netanyahu came into office, the understanding was they will not make the same mistake that Olmert made and ask for something the president might say no to. Better to ask forgiveness than to ask permission.”
If Israel independently launches World War Three, I don't think forgiveness is an option. This isn't an alliance. It's a form of blackmail.
The Dish 