I'm sorry, I don't buy it. The "it's too dangerous to release" line has turned out every single time to just be a marketing blurb to get people hyped for whatever it is that they haven't yet released but most assuredly will release. It's spouted either by researchers who are naturally overconfident in their own research field or by the executives of major corporations who would benefit immensely if prospective users and governments overestimated their tech's capabilities.