Unless they wanted to stir us up, to ignite a very large war. We're dealing with people who plow airplanes full of people into occupied skyscrapers, people who have already butchered, raped, etc. hundreds of schoolkids, teachers and parents, etc., etc. These are not normal, sane people. To them, "stupid" has a different definition that for normal-thinking Westerners of the early 21st Century.
Heaven help us - because our borders are like a sieve and thousands of the enemy are very likely to already be here.
I could see where they’d provoke and then blame us for some stupid reason. But just like the Afghan warlords who were shaking swords and sticks vowing that they would overcome us, they underestimate us. Osama did when he thought that taking down the Twin Towers would bring us to our knees and destroy the US. They have no concept of our size, might, and resources, or character.
It would indeed get messy. I do think we could prevail, but not without cost.