Comment by spot

opinions of 187 scientists and other writers and thinkers (Dennett, Smolin, Rees, Dyson, Rushkoff, O'Reilly, Coupland, Kelly, etc etc) on thinking machines on edge.org (and many of them address the threat issue):

http://edge.org/annual-question/q2015

including mine:

http://edge.org/response-detail/26219