All the gun control groups are touting the recent AQ video telling terrorists to go buy machine guns at your local gun show.
Anyone who knows anything about firearms knows this is complete nonsense so, after we laughed at them a bit, they started modifying the message, not mentioning the 'fully auto assault rifle' bit and just pushing the 'gun show loophole' and terrorists in the same breath.
So the demographic they're going for is the ignorant and the fearful. They convince their membership that these things are true then try and get them to talk to other people who don't know anything about gun shows or firearms, scaring them in the process.
They count on their people to NOT look up the actual sources (case law, legislation, etc) and continue to rely on soundbites and misinformation put out by their groups and their groups alone. To dismiss anything that disagrees w/ their worldview by invoking the "NRA" boogeyman.
And they repeat the lies over and over and over. Relying on the tactics of cults to keep their members ignorant and fearful.
It's the only way they can spread their message.