SHATTERED bodies after the explosion, bloody severed heads on the roadside; what is all this supposed to say? What's the message? Protest maybe, maybe the desire for a show of competence. But as time goes on, one increasingly senses that terrorism is a cruel step along a road without end. This path of violence has been chosen for political struggle now for 900 years, and yet it has never got very far. The Hashshâshîn started it in