Jim ~~ I don't think anyone has suggested that 'all Muslims' sympathise with such violent practices ostensibly in support of their faith; but I would commend to you the ongoing correspondence in The Times regarding the attempts by Dr T Hargey, Imam of Oxford mosque, to distance himself from the offenders' actions, and the extent to which correspondents consider these to have fallen far short of an outright denunciation.

Never, in addition, forget the wise words of Yeats in 'The Second Coming' ~~

The best lack all conviction, while the worst
Are full of passionate intensity

~~ It is an unhappy phenomenon that those with enough 'passionate intensity' to commit such acts are those liable to be regarded as the spokespersons for whatever cause it may be that they purport to espouse.

~M~