The question is not whether Bostrom urges caution (which Goertzel and many others also urge), but whether Bostrom agrees that the Scary Idea is true -- that is, whether projects like Ben's and others will probably end the human race if developed without a pre-existing FAI theory, and whether the only (or most promising) way to not incur extremely high risk of wiping out humanity is to develop FAI theory first.