Mohammed said, "I have been made victorious with terror ".
Since Mohammed is the 'Perfect Man', the model of righteous behaviour for all Muslims, terrorism is divinely approved.
Of course not all Muslims are terrorists, but all true Muslims must condone terror against the infidels. To do otherwise would be to repudiate Mohammed, which would make them into blasphemers - the penalty for which is death.
The root cause of Islamic terrorism is Islam itself.
This royal throne of kings, this scepter'd isle,
This earth of majesty, this seat of Mars,
This other Eden, demi-paradise,
This fortress built by Nature for herself
Against infection and the hand of war,
This happy breed of men, this little world,
This precious stone set in the silver sea,
Which serves it in the office of a wall,
Or as a moat defensive to a house,
Against the envy of less happier lands,
this blessed plot, this earth, this realm, this England.