Two separate rules are being mixed in this thread : Coopers Rule #2 ( Never allow the muzzle to cover anything you are not willing to destroy ) and the folklore gunfighting admonition, " Don't draw your gun except to shoot " , which is totally wrong : You draw when you must be prepared to shoot .
Gabe Suarez took issue with Rule #2 because there are times, such as holstering, when your muzzle may cover you . Splitting hairs .
Note : Jeff Cooper himself dry practiced at his T.V. set because he was " willing to destroy it ".