Also from the BBC:
During a recent interview (full transcript) for a University of Oxford project, BBC director general Mark Thompson provided the most in-depth admission yet of the BBC’s double standards with respect to faith. Christianity, he explained, receives less sensitive treatment because it is “a broad-shouldered religion, compared to religions which in the UK have a very close identity with ethnic minorities.” Specifically, Islam in Britain is “almost entirely a religion practiced by people who may already feel in other ways isolated, prejudiced against, and where they may well regard an attack on their religion as racism by other means.” Thus, when asked whether the BBC would run a Muhammad-mocking program on a par with the Jesus-ridiculing Jerry Springer: The Opera, which it aired over Christian protests in 2005, Thompson answered that it would not. Depictions of Islam’s prophet, he maintained, could have “the emotional force” of “grotesque child pornography” for Muslims.
Actual reason: cowardice
News anchor Peter Sissons, who left the BBC several years ago, echoed him in a book published in 2011: “Islam must not be offended at any price, although Christians are fair game because they do nothing about it if they are offended.”
More links here