What gun for zombie meme?

That was my thought as I read this:

Like most insurgencies, the Mexican drug armies also have an external source of funding and weapons. Shamefully, that is the United States.
...
Despite an eloquent appeal by Mr. Calderón during an address to Congress last spring, neither the Democratic leadership nor President Obama has dared to push for a reinstatement of the ban on sales of assault weapons.

So apparently, Calderon's "eloquent appeal" should take precedence over the Supreme Court ruling in Heller v. D.C. that arms such as the AR-15 and AK-47 are protected as arms "in common use" under the Second Amendment to the United States Constitution. (It deserves to be pointed out, once again, that since the expiration of the Clinton "assault weapons ban" in 2004, the AR, AK and rifles like them have gotten to be the hottest-selling guns in the country PERIOD, which would arguably put them squarely in the middle of the "in common use" territory.) I remember the apocryphal quote from George W. Bush that the Constitution is "just a goddamned piece of paper" or something to that effect, but it appears that viewpoint is held rather by the editorialists at the Washington Post and every other media outlet calling for a ban on semiautomatic rifles.

And again, what of the full-auto weaponry, RPGs and such that the cartels are using that is highly illegal in the United States? Why no mention of any of that?