Islam is at war with us. Actually, Islam has been at war since its inception in 610 AD. We are just the new kid on the block. If you look back at U.S. history, we have had problems with Islam since our inception. We have just been able to avoid dealing with it because we are in a different part of the planet. With modern communications, travel and economics, the world is a much smaller place. Now we are the big guy who needs to be put in his place. But this does not leave out the rest of the world.
The U.S. is not forcing our Islamic enemies to engage our military. That match up favored us and drained their resources far more quickly than ours. Now they can re-deploy and just look at how well they are using their forces now!