Perhaps you skimmed over this part of my essay above.
In ancient Islamic history, the black moon rock was once stolen by a competing tribe, but after a brief time it was “found.” Islam carried on because nobody outside of a very small circle of imams even knew the rock was missing before it was replaced. But if Mecca was suddenly turned into a giant crater, there would be no way to conceal the fact from the world at large, including every Muslim. Today, observant Muslims believe that if every infidel nation fired every rocket and bomb at Mecca, Allah would turn them back or stop them in mid-flight. It is impossible for observant Muslims to believe that the Infidels could destroy the Kaaba, which is literally the physical manifestation on earth of their “greatest God.”
The Crusaders were only able to retake Jerusalem for a short time, and never got close to taking Mecca (assuming that they even understood its importance to Islam and had some notion of taking it). It was not within their power to threaten this source of Islam’s power and mystique, even if they had desired to do so. In all eras before modern mass communications, even if a Crusader “commando team” had made it to Mecca, it would not have changed anything, because the leading Muslim clerics would have replaced the black rock and rebuilt the Kaaba, and nobody would have ever known, in the same way that nobody at the time knew that the black rock had once been stolen and carried off.
Today, the entire world would know in the same hour that Mecca had been destroyed. This would destroy Islam as surely as the Aztec and Inca religions and empires were destroyed when the Spanish conquistadors captured and executed the “living Gods” at the center of the Aztec and Inca belief systems. If there is no Mecca, there is no Islam. There can be no Islam with three instead of five pillars, the two physical pillars having been destroyed by the Gods of the Infidels. “Allahu Akbar” means “our God is greatest.” This cannot be so if the Infidel God destroys the physical god-head of Islam, which is the black moon rock at the Kaaba in Mecca.