Every so often somebody comes up with another set of firearms safety rules: Once upon a time, there were Ten Safety Commandments for hunters, while the Army had fourteen; there are the Four Rules from Gunsite; the NRA is currently touting Three Rules; now Alan likes a focus on Two Rules.
It's not particularly iconoclastic. It's been done before and will doubtless be done again.
May I propose a Rule Zero? How about let's go with "Don't Be An Idiot." I don't know which rules are in your head, and how many of them there are, but as long as your actions are safe, it doesn't really matter to me.
EDIT: As Earl pointed out in comments, my proposed Rule Zero only works with robots. Alternatively, I offer my own personal Rule Zero, which is "Assume You're An Idiot." I always act on the assumption that I could suffer from a sudden attack of The Stupids at any moment, and handle firearms accordingly, so that the result of such an attack will be embarrassment rather than tragedy.