Steve brings to my notice that John Brockman is asking about "dangerous ideas" over at Edge. Greg Cochran's response might interest some readers, as will Steven Pinker's. There's a lot in there, but Irene Pepperberg, Keith Devlin, Timothy Taylor and Robert Shapiro gave responses that jumped out at me. Bart Kosko's bell curve response is a must read. Skimming over the responses the idea that there isn't a soul and the perception that our understanding of the world around us is cognitively constrained seem to be relatively common opinions as to what is dangerous.