None. I believe that it is important to respect the views and beliefs held by others, even if you do not agree with them. However, respect is a totally different thing from tolerance.

Tolerance, like intolerance, can be extremley dangerous when taken to extremes. If we tolerate bad behaviour of any kind it engenders boundaries being pushed back further. Respect allows for differing opinions, but does not allow for those opinions to over-ride our own.

On the question of the importance of the Koran - this is a holy book, containing the words of the prophet Mohammed, and, as such, I can understand why Muslims object to its misuse. Christians swear on the Bible, another collection of marks on paper, but which has a great deal of significance for the followers of that belief.