I'm only as serious as they are.
If they really can rally the Islamic world to try to kill us, every man woman and child, then I think we would rise to the occasion quite well enough. It wouldn't be genocide though, we'd set aside a reservation for the remaining few.
Because we use our power with restraint, much of the world interprets us as weak, because such restraint in the use of power is a totally alien concept to them, and that causes them to make mistakes.
Of course we'll be blamed for their mistakes - if we hadn't exercised restraint they wouldn't have misjudged us, so it's all our fault, as usual.
