What is ISIS really? An assortment of Muslim extremists dressed up like Ninja fighters in tennis shoes. ISIS is not an officially recognized standing army. ISIS is not a professional military force. ISIS is little more than than a motley crew of murderous savages in need of a good spanking. They kill, kill, kill because no one has really stood up to them. The Idaho National Guard could probably decimate these radicals in one month if allowed to confront them without the handcuffs of political correctness.
Make no mistake, ISIS could lay a BIG HURT on the United States if they managed to pull off a terrorist attack on our homeland. This is the real threat; that a bunch of depraved maniacs from the Middle East contrive a plan to attack us here at home. As an open society, we are vulnerable to the machinations of savage beasts whose mindset has no connection to humanity or civilized behavior.
ISIS and its followers cannot defeat the United States in any conventional sense of warfare. But, if they should come into possession of WMD's or pull off a coordinated series of terrorist attacks inside the US, then, the consequences and costs change. We would, of course, survive a terrorist attack, but depending on its severity, our freedoms and way of life would be altered.
Rather than wait for ISIS to attack us as they have promised, defeat then now without mercy. While we dither, they grow stronger. ISIS has big ambitions, eliminating ISIS now will be much easier than months or years down the road. Do not allow them to become formidable. We might not have the luxury of months or years.