I'm less afraid of "bad guys" than I am of "good guys" who make mistakes.

Looking at history of accidents with machines, they seem to be mostly automobile accidents. Medical accidents are number two, I think.

In both cases, technology that proved dangerous was used deliberately - before the relevant safety features could be added - due to the benefits it gave in the mean time. It seems likely that we will see more of that - in conjunction with the overall trend towards increased safety.

My position on this is the opposite of yours. I think there are probably greater individual risks from a machine intelligence working properly for someone else than there are from an accident. Both positions are players, though.