You make important observations about the limits of Castle Doctrine. Overall it really isn’t much of a deviation from the usual SD principles, except for those backwards states that have a “duty to withdraw”. I personally feel that is a flawed theory. NO ONE should have a duty to withdraw in the face of danger. That gives too much advantage to the attacker. So in my mind what the Castle Doctrine does is within the structure defined by law as “castle” no longer requires one to withdraw.
Extra tough on a christian patriot
Great observation 
think you dead on ( pardon the pun) with that statement @Devereaux
How ever I only got 2 cheeks and dependent upon what I perceive to be the size of his gauntlet my own fire breathing gauntlet will come out to play. 
To break that down , for me it comes down to intent. If I perceive the intent of the perpatrator to be one of danger to me or loved one I will send them to meet their maker…being it at the pearly ones or the firey ones .
An insult that results in a slap to the cheek is a lot different that a firearm or Knife , crow bar or baseball bat pointed or weilded in my direction
In Missouri If you have a legal right to be somewhere you can defend yourself . You do not have to be in your house . I can be on the back forty of my place or just walking down the sidewalk . If I am threatened with bodily harm or death I can use whatever force is necessary to defend myself .
Although not a lawyer, I would suspect the majority of states are like that. But there are crazy wrinkles state to state. “Statehood” is kind of a funny thing. In some aspects it trumps nationality; other aspects i is more like in the founding days, when one’s primary allegiance was to his state. So we still have. the patchwork of “social systems” we call states.
Some states simply view themselves as “special”. Most of the time these “special states” are highly progressive. These we’ve all come to identify as being filled with goody-two-shoes, always ready to tell you what’s good - for you. So NYC, despite ALL THE HX, insists on treating you like a subject and nor a citizen. Iowa or New Mexico, for instance, treat you if you live there as a citizen, but as a foreigner if visiting from out-of-state. (So no OOS CCW)
I see your point, but such considerations are personal and not legal. Duty to Withdraw is a legal concept, which you follow or not at your earthly peril.