Re: Star Wars: The Clone Wars- Season One
I haven't done any study or reading on Order 66, but I always took it as kind of a post-hypnotic suggestion type of thing. It was ingrained in their cloning process, something along the level of out autonomous system, which handles things like blinking and breathing. Once they heard the command "Execute Order 66" I didn't think it was like "Oh, the opposite side just asked us to kill our leaders... sounds good." When it came to that order, they were essentially Androids (a robot in human form) carrying out programming.
Reading this thread, the book "Dark Lord" doesn't seem that it is about a group of clones that just decided not to execute order 66. Rather, I'd read the words as this was a group of clones that never had Order 66 programmed into them to begin with. Or they had counterprogramming so strong that it superseded Order 66. I could be wrong, though, as I never read the book.