Machine guns are banned because they are only useful for spraying bullets and killing mass amounts of people in warfare. At least that is the reasoning given by those government types that know what's good for us. That being said if machine guns are only good for killing mass amounts of people why is it that every major law enforcement agency in the US, Every federal law enforcement division (and there are too many to list) ALL have machine guns? What law enforcement function does a weapon only good for killing mass amounts of people and spraying bullets everywhere have? Ask yourself how often law enforcement officers, even swat teams need to just kill massive amounts of people and spray bullets everywhere?
Folks the second amendment is not just about citizens having the right to possess guns it's SPECIFICALLY about the right to possess machine guns. You see the intent of the second amendment is to ensure the balance of power remained with the people. This picture makes it very clear that balance of power has been expressly violated by the ban on machine guns. You see in the event where a rogue government either foreign or domestic comes for your liberty they are going to bring a machine gun and nothing less.
For those that are not familiar with firearms The picture of this federal agent coming to take this child for deportation is holding an H&K MP5. A machine gun.