Well, what is the argument for disaster? It's that LHC will turn into a "Black Hole Factory" (CERN's term--not mine). It's that the string theorists are correct, and we actually live in a 5-dimensional world. It's that maybe, just maybe, Hawking radiation--a hypothetical phenomenon that has never been observed--might not actually happen, or if it does, it may not happen fast enough. Meanwhile, both particle physics and cosmology are ripe for one of those "shocker" moments, when you realize this ain't the way I thought Kansas was supposed to be like moments.