I'd like to take another look at the article I looked at earlier. It seems to me that there are a few assumptions being made that are just not correct.
First, basically, is that they're right. Now, this is sine qua non for any armed revolt, but it deserves saying. What's truly scary is what they believe they're right about. There's a commenter in the thread who, honest to God, believes that the swine flu vaccine is a plot to wipe out the majority of the world's population. That's over and above the classic RW belief that Obama is some kind of secret Muslim communist dictator who is stripping them of their vital liberties. The claim is there that Obama (and the other bogeymen for the Right - Speaker Pelosi, Barney Frank, and, for some reason, Van Jones) are "making a mockery of our Constitution" and must be stopped by any means necessary.
The stunning thing about this is that none of the actual reasons to rebel are supported by facts. This is a movement will and eager to kill fellow citizens over urban legends.
The second erroneous assumption is that, in the event of the prophesied rebellion, the army will face mass desertions as the patriotic young men of the armed forces will remember that their oath includes enemies foreign...and domestic.* And, should the devoutly-wished consummation occur, I have no doubt that they will. Because, frankly, a marauding fascist movement shooting people in the street for voting the wrong way in the last election and eliminating "undesirable" elements fits the definition of a "domestic enemy" better than anything I could have come up with on my own.
Third, the related assumption that in the event of the rebellion and the mass desertions that will follow it, the government will call in the UN and send foreign troops to kill Americans. I would, of course, remind the murder-fantasists that the last time we had a civil war, it was handled domestically, with federal and state forces augmented by a draft. Granted, given that this assumption a.) comes from the previous flawed beliefs and b.) is a rehashing of that 90s favorite New World Order conspiracy theory, it's pretty much dead in the water.
All these problems, basically, stem from the first wrong assumption. They assume that they are the rightful owners of this land, and that they will be able to strike down the usurpers. Their theory does not bear any resemblance to reality.
*The "and domestic" language has become a RW shibboleth. There's a group called "Oath Keepers" who seem to be dreaming of some kind of military coup, and it appears on teabagger signs frequently. It's up there with the McVeigh "Tree of Liberty" quote as a warning sign.