Maybe islamofacists upset by cartoons
It might not the cartoons, it could be
1. The Crusades
2. Anything that happened before the Crusades.
3. Anything that happened after the Crusades.
4. A woman publicly smiling.
5. Someone browsing at a bookstore, casually picking it the "Holy Koran" and not putting it back at a 90 degree angle exactly perpendicular to the right front corner of the table whose front legs are facing Mecca.
6. George W. Bush.