I got to thinking about this the other night while watching a movie.
The people in Hollyweed might be stupid but they're not dumb. They know that movies make wonderful propaganda tools, and I really wonder if they don't put some of these myths into movies on purpose, as opposed to just being ignorant.
Some of the common themes I see are.
Automatic weapons widely available.
Gun registration in places that don't have gun registration.
Fugitives can get guns W/out a background check, easily
"Cop Killer" bullets
One of the most common myths I see (From "Shane" to "Billy Jack")
is that self defense (especially armed self-defense) is wrong and some thing that "ordinary" people can't do.
Another common theme I see is the idea that it's somehow honorable to take the escalating attacks of the villain W/out fighting back until some mythical line is crossed when the hero goes and kills everybody
Although a lot of those movies are pretty accurate in depicting that the armed bad guys pretty much have their way W/ the unarmed peasantry until somebody gets tired of it and picks up a gun.