Hey, muslims have given us great advances in propaganda and the use of human shields.
They can make evil look good and good look evil.
That’s hard stuff.
There were some greats. I, who am no scholar, know of Ibn Rushd (aka Averroes) of Andalusia. But something happened that led to a long slow decline. And good arguments have been made that the "something" was the rise of an anti-intellectual strain of theology. I dunno, but it sure seems likely to me.