Obviously, to Islamists words are meaningless. But to Americans and Israelis, words mean things.
You are trying and failing here. If your neighbor told the neighborhood for years that he wanted to kill you and your family, and he made every attempt to do so but had not succeed in completing the task, would you still say that his mission did not matter if your neighbors rebuked you for acting on that knowledge? Or should you ignore his mission because it's just words? LOL
No, I would grab my Berreta .40 and pop a cap in his brain can. I wouldn't however, then tell everyone that I needed to do the same thing to his entire family and everyone who practiced his religion.