This is the dark underside to Romanticism, the movement that gave us Byron, Blake and Shelley, but with figures such as Kleist, also the beginnings of the violent anti-rationalism which would feed into fascism. And just as Romanticism was in part a revolt against grey utilitarianism, so its darker descendants today are able to tap into the many who feel adrift, abandoned or just plain bored and disillusioned with the modern liberal world, seeking something more primal and primordial. As Sonta...