“Free, free Palestine — from the river to the sea.” I was met, as so often elsewhere, by this ubiquitous chant from the standard issue protesters when I arrived at the University of Essex in the UK to give a talk last week. What river? What sea? I doubt many of them knew. Most of these students are fed such slogans when they are coaxed to come out and demonstrate by the campus rabble-rousers — a little bit of animation to distract from the monotony of student life on an autumn evening. Their distraction comes at a cost. Not to...