We're not, we don't ask for permission before defending ourselves.
Whenever we feel like it, if we ever do.
Being the mightiest military and economic power in the entire history of this little planet has its perks, and those who don't want us abusing said perks would have been clever to have left us alone.
The giant isn't sleeping any longer.
Likewise, the Palestinian nitwits are getting the war that they asked for. They said that they wanted to die as martyrs for their cause, after all, and there isn't much more than that they can do to Israel's superior military.
Here the Palestinians had a sympathetic press with which they could have pounded Israel into submission via negotiations and negative media coverage day after day, yet they chose the more macho military option to resolve their dispute. That's extremely unwise for the weaker military power to select as its preferred option.
A few of those Taliban and al-qaeda survivors in Afghanistan may have even figured the above lesson out on their own by now...
Unfortunately, it appears to be the goal of What's Left of the United States to have as many of our soldiers in as many countries as possible. That way, when we need UN help to defend our "homeland," the sheep will be amenable to the idea, since all of our soldiers are occupied elsewhere.
I feel sorry for the first guy I see on *my* street wearing a blue helmet. They make such good targets.