Why does it need to be a metaphore?
This viewpoint is why the 2A rights movement constantly finds itself banging it's head against a wall, or talking to an audience with the "deer in the headlights" look...
We live in a society where the populace has been INTENTIONALLY dumbed down, and through a concerted effort in the Education establishment, for over 30 years, has had it's abilities for critical thought and rational understanding almost completely eradicated.
The teaching of logic, ethics, REAL history, civics, philosophy and rhetoric have been replaced with feel-good subjects like "social studies", "language arts", and "set theory".
Because of this, the majority of the population quite literally can't understand rational arguments. They can't understand references to history, appeals to ethics or morals, or concepts that require more than 2 steps of philosophical linkage.
We can thank a litany of Globalists, expatriot Nazis, filthy rich "Socialists", Public Relations wonks, "Educationalists" and other demonic spawn for this condition.
But the end result is that the majority of the population of the US isn't much better off intellectually than the cast of the movie "Idiocracy".
So to reach their enfeebled minds (made that way through forced drugging through their food, water, and medication, and by an "education" system intentionally designed to render the People incoherent, irrational, and uninformed) we must resort to more basic methods of communication. We must appeal to emotions, to easily apprehendable images, and to easy-to grok symbols. It is a fundamental principle of PR--make a strong emotive linkage with something that people can readily understand or relate to, if you are trying to sell a complicated "product" (whether it is a computer, a political system, a financial instrument, or a philosophical concept)
We see the truth of our argument, because we are "awake"--we have studied the history of "gun control" and we know that it's roots are in the disgusting, despicable practices of racism, classism and sexism. We have studied the Founding Fathers, and we know what they intended with the 2A (even if 4 of the supposedly smartest judges in the land don't...) We study the law of our states and localities, and case law, and Federal law. We have somehow escaped the clutches of the mind-numbing Educational Establishment, and have propelled ourselves into a world of information and knowledge that the VAST majority of the American People don't even know exists.
But most folks don't do these things. They work grueling jobs they hate for bosses who are low-level sociopaths, they come home and numb their pain with prescription "antidepressants" and self-medicate through drugs and alcohol. They watch all sorts of mind-numbing TV, and waste their free time rooting for sports teams, watching reality TV, and trying not to get in trouble with the government.
Trying to explain the power of "Open Carry" to the average American--even someone who is supposedly "pro-gun" can be like explaining Schopenhauer to a 5-year-old...
So we use metaphors.
This isn't rocket science. But it IS Public Relations, and to be honest, PR is every bit as complicated, technical, and dangerous as rocket science--especially when you are experimenting with new concepts and practices.
I hope that helps you understand why this thread exists. It's an exercise in creative thinking--bring people "outside the box" and allowing them to think about OC in a manner that people who aren't "gunnies" or rabid Constitutionalists, or history buffs can relate to...