Their main thing they state is that we are allowed by the constitution to defend our country against a tyrannical government. The 2nd amendment actually only states: Amendment II
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.
So lets say for a minute that their interpretation is correct. What they fail to realize is that in their opinion we already have a tyrannical government and they aren't doing anything about it other than complaining on Facebook about it. So why don't these pussies with all the guns rise up and end the tyranny? Maybe in the back of their mind they realize that the government has more man-power and weaponry that they can possibly imagine as proven to their brothers in arms; Tim McVeigh, David Koresh, and the Weaver family at Ruby Ridge.
Their delusional diatribe states that to fix the gun problem there needs to be more guns, which makes as much sense as infecting everyone with AIDS to solve the AIDS problem, or require everyone to drive drunk to stop drunk driving.
The government logistically can not round up all the guns, but if they wanted to solve the gun problem they can make it illegal to manufacture or import any weapons in the United States. This will stem the flow and eventually all the guns that can be stolen and used in a crime will be confiscated.
Then to protect the peoples right as explained in the 2nd amendment the only fire arms that should legally be manufactured and purchased in this country will have the exact form and function of any fire arm that was produced in 1791 when the constitution was adopted. That should be more than enough for hunting and for the occasional murder, but not fast enough to reload to shoot up a school, a church or a shopping mall.