Why are AR-15′s ‘Personal Defense’ Weapons for the DHS but ‘Assault Rifles’ for Citizens?

Activist Post Why are fully-automatic AR-15s with 30-round magazines and hollow-point bullets called ‘personal defense’ weapons when the Department of Homeland Security purchases them, but semi-auto AR-15s are assault rifles in the hands of citizens?
The Department of Homeland Security filed a purchase bid this past June titled “Personal Defense Weapons Solicitation”.  It is combined bid for 5.56x45mm NATO ammunition and “select-fire firearm suitable for personal defense.”
Increasingly the government is giving itself privileges that they are taking away from citizens. This is becoming most obvious in regards to gun rights, but it’s becoming a widespread abuse of power across all aspects of society. The government is supposed to derive its authority from the people not the other way around.
Ron Paul recently addressed this exact topic proposing the simple solution: ”Anything the government assumes they have a right to do to us, we should assume we have a right to do that to them.”
If we are to be a nation of, by and for the people where the government has no rights that aren’t afforded to citizens, then this assumption may be the check on government overreach that’s so desperately needed.
By the way, the DHS is only authorized to work within the U.S. borders, so who do they plan to use these weapons on?
Watch the brief video below covering a bit more detail on the DHS purchase order:

Department Of Homeland Security To Purchase 7,000 Fully Automatic AR-15's For "Personal Defense" http://www.youtube.com/watch?feature=player_embedded&v=Y9oAi8agPmk

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