On the contrary - insecure people can't deal with mockery, and so they resort to violence. See the storm which always erupts when someone dares mock the Religion of Peace (TM) for a good example of what I mean.
They rather get a bye because most other religions can take it as banter, because nobody seriously believes that all Christians are gay-hating rednecks and all Hindus are ascetic monks who never wash. Muslim stereotypes on the other hand are very much accepted by a great deal of people, and they do get a lot of violence directed against them. I'm not condoning the reactions that we get whenever the press makes a joke at their expense, but you can at least understand them.