Flemming Rose, the Danish editor who published the controversial cartoons of Mohammed in 2006, says the violent response to them caught him by surprise. Similar cartoons had been published previously, even one depicting Mohammed as mentally ill, with no particular reaction.
As to why Muslims had reacted so harshly to the cartoons, Rose said, "According to [Mideast expert Bernard] Lewis, this is the first time Muslims try to impose Islamic law on non-Muslim countries." He attributed the riots to "Muslim immigration to Europe and the fact that there are Muslims who don't want to be integrated… There's a problem with Muslims in Europe and it must be dealt with – but limiting freedom of expression is not the solution."
(Thanks to Jihad Watch.)