Because as soon as you open the door you are no longer in a defensive position, but an aggressive position. Oklahoma's castle doctrine does not extend outside the home. Therefore you have to have an immediate threat to justify deadly force, and someone standing on your porch and banging on the door does not constitute an immediate threat but rather a potential threat. And there is not retreating, you are already behind a closed and (presumably) locked door.
This would be a hard sell. The delivery guy would get on the stand and say he knocked on the door. If thinking that a knock on the door constituted a reasonable belief that someone is trying to break in, there would be several cases of Jehovah Witnesses getting shot through a front door. Since the delivery guy was outside the home, the usual caveats of when you can pull your firearm apply, and quite simply this scenario doesn't have them. Mr. Doe was not in imminent danger (the DG was still outside, door was closed). He could not see if anyone else was in imminent danger. The only thing Mr. Doe has in his defense is he thought someone might be trying to break in. That won't hold in court. Unless it was a Jehovah Witness that is (I kid!).
Who says that opening the door negates being in a defensive position though. 1289.25 allows for the use of force if it is reasonably believed to be necessary to STOP the illegal/forcible entry. To me, that language does bit say that you have to wait for someone to kick in a door and stroll into your home before you can point a firearm.
Also, it should be noted that pointing a firearm is not deadly force, but merely defensive force.
What about Mormons though?
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