This is obviously a bit for them to get attention...and it worked.
I try to not get too overworked about the things that go down in society nowadays. Yes, what they did is disrespectful and cruel but they are going to do whatever they can to push their boundaries to the furthest possible limits (thats why they are called extremists), and they will get away with it because society is more liberal now than it has ever been so they know they will have very few repercussions for their actions, and they are using that ability to spread their beliefs in as negative a way as possible.
I feel there is a double standard though. The extremists can sit there and spew crap about Christians and the Western ways on our homefronts and thats okay...but if WE were to go over there and talk crap about Islam, Allah, or any of the above, it would likely result in an all-out war.