WW3 scenario....
Indignant, emphatic response to a '9/11' equivalent terrorist attack which is a little overzealous and pre-empts unilateral accord.
Collateral 'civilian' damage fuels festering Anti-US inclinations, resulting in more attacks on US soil/property.
Etc, etc, etc.
For 'target', insert 'any' country, if not most.
Once upon a time, there were 2 'super' powers, and the world figured that it'd be the Ruskie's fault.
Now there is only one 'Super' power, and with concepts of 'pre-emption' being considered, the world is understandably 'nervous'.
It may be horrible to consider that US/UK/AUS actions 'could' be actually 'bad', and have dire consequences, but as unimaginable as we'd like it to be, it could still happen.
Let's all wait ten years or so.
If I'm alive and breathing...and don't glow in the dark....and our [Aussie] F18s get back from Iraq, and our SAS and our ships as well, then it won't be ALL bad...