I think that a goodly portion of one's doctrine is dictated by one's attitude and awareness. Predators are able to sense fear in their victims. If you go about with a confidant aire about you (not some macho b.s.) others can sense that and will think twice about making you their next victim.
Also, i don't think you can lay down a set of "rules" per se, as each possible encounter will have a very complex unique set of variables. Of course you should have general guidelines. There is always fight or flight. Possibly even a specific set of "rules" for a situation that you could go into on a regular basis (i.e.-end of day cash deposit).
I guess what I"m saying is that basically I agree with you.