Whatever number of the largest conventional bombs in the arenal of the United States military you say that it would take to take out Mecca, I will for argument's sake accept that number. Whether you say the number is one hundred (100), one thousand (1,000) or ten thousand (10,000), the point is that Mecca can be taken out with conventional bombing.
Supposedly also with flatulence.
Sure we did it with Dresden. Mecca has about 700,000 residents. So many to kill, so little time.