Quite frankly, I think the term "enemy" is from a semantic point of view about the worst word you could possibly use.
"Enemy" brings up the image of a person who must be destroyed, and utterly defeated. Enemies are to be hated, and not to be reasoned with. And ultimately the simplistic nature in which "enemy" is getting tossed around in this conversation, belies the real issue which requires a vocabulary much more nuanced to talk about the degrees of various people and their views.
Would you consider someone who believed you have a right to defend yourself an enemy?
Would you still hold the same view of the above person, if that same person stated that learning martial arts is an acceptable manner in which to defend yourself but not firearms?
Or to go to the other extreme, from a purist liberty approach, one might argue that anyone should be allowed to own nuclear or biological weapons. So long as they don't use it to infringe on other's rights.
The fact of the matter is there is a level of degree to the argument of an armed society, and different people will draw the line in the sand at different points.
I would wager most of society finds Martial arts, stun guns, and pepper spray to be acceptable methods of Self defense (even us gunnies who may scoff at such weapons, believe that if the person chooses they should be allowed to pick from such a weak set of weapons)
For most folks on this forum, I would wager being allowed to own pistols, rifles, and maybe even machine guns is the appropriate place to draw the line.
But if you upped the stakes, say allowing people to own tanks, Surface to Air missiles, Apache gunships, or fighter jets, I'd wager a portion of the population on these forums would believe that is going too far.
Take it up another notch, should a private citizen be allowed to own and operate a carrier group with mercenaries equivilent in training to our armed forces? That notch will probably see another chunk of population drop off in support.
And ultimately should a private citizen be allowed to own a weapon that could indescriminately kill millions of people? Nukes etc? I'd be real surprised if anyone could with sanity argue this would be an acceptable state of liberty to allow, because ultimately while from a purist philosophical point, one might state that anyone should be allowed to do anything so long as it doesn't infringe on another's rights, the reality is, private possession of such a weapon could by it's mere presence infringe on other's rights. And if you don't believe that the mere presence of these weapons is not in and of itself a weapon, I'd refer to go look at the cold war, and the results M.A.D.
So you see there is a large part of this argument that is a matter of degree. I personally wouldn't have an issue with someone owning a tank or apache, but I'd be pretty hesitant to allow a private individual the ability to operate a full military force without any sort of control.
For antis, either due to ignorance or willfulness, they see guns as the line in the sand. They feel that having a gun is allowing too much power to be vested in one person. I respectfully disagree, and I will vote and argue to counter their view.
But ultimately, if enough voters passed an amendment undoing the 2nd, I'd have to give serious consideration to just simply living with the new rule. Essentially at that point they would've won, fairly and in accordance with our constitution.
What irks me now, is that the current gun laws are slipped in, or forced through without going through the proper channels, and our courts being packed a certain way refuse to strike them down in accordance with the 2nd amendment. I don't mind losing in the arena of ideas and politics if it's a fair fight. Problem is the leaders of the Anti-gun movement don't play fair.