> This, unfortunately, killed people: Therac-25. Granted, the underlying cause was a race condition

So it didn't kill people, something else was that cause

I'm not trying to shift blame to the operators here, but in the absence of flying fingers, nobody would have died. Many, many, people received the right treatment in the Therac-25 machine.

Also, the author of the buggy software had no idea it would be used to operate a machine without a hardware interlock as, AFAIR, it was not modified prior to being used with the Therac-25 model.