“Some nut-case getting hold of reprogrammable self-replicating nano-bots, originally developed by mainstream experts for benevolent uses, is indeed a very scary thought… As I’m sure you know, sad experience has shown that often people who commit suicide, or arson for revenge, or similar violent acts, have no notion of the wider and lasting implications of their impulsive behavior. So yes, I certainly agree, some loony with the access to the tech, and the fleeting moment of irrational motive, could indeed precipitate a gigantic state-change of the sort considered in the math of Catastrophe Theory, far beyond the bad actor’s expectation or comprehension. Yikes!”