Isn't it true of everything though? Explosives, airplanes, electricity, computers - all double edged swords that have both greatly benefited humanity and caused great harm (with the potential for a lot more of both).
The sentiment of "Oh by the way this stuff is super bad and dangerous so we should be careful" just rings pretty hollow from someone who is at the tail-end of a career spent in pursuit of that exact bad, dangerous thing. If he were 20 years younger or not wealthy it's hard to believe that he would be saying this out loud, even if he believed it.
Also this sentiment rings _extra_ hollow from someone who supposedly left CMU because he didn't want to accept Pentagon funds or work on things that would be used for war. That feels like either an incoherent value system or some pretty substantial half-truths to me.