'In an ideal world you would stand at a crossroads, one big white sign pointing to SANITY, and the other to MADNESS, and in the broad light of day, with the sun on your back, you would make the only possible choice you could, and trot down the hill towards safety. Why make any other choice? The trouble is that when you personally get to that crossroads it's nearly always midnight, you haven't slept for a while, and some kids have been...