But people like al-Khwārizmī and Averroes worked in the 12th century and prior. After that it's like that light went out on Islamic scholarship. What happened?
It started with this: the fundamentalists had a problem. In their view, everything man needed to know was in the koran, and anything science could reveal which wasn't in the koran (or worse, contradicted it) was thus a lie created by satan. So basically science was to be avoided because it could only corrupt. They won the debate. And as a result Islam devolved into a primative, bloodthirsty gang that burn people for casting evil spells and other absurd medieval nonsense. For 1,000 years they have existed in this primative state. All because someone decided that agenda trumped science.
Woe unto us if we allow that to happen to the west. Its already beginning with the rise of 'consensus' science centered around political objectives.
the moslems were pretty blood thirsty in the 400 years before that as well