I wish them luck too, but they sure played fast and loose with 18 U.S.C. 930(c) when they state The law cited by the Post Office creates an exception for “lawful carrying of firearms” for “other lawful purposes."
NAGR left out two very important words "incident to." (The Code Section in question is quoted below.) The subpart (c) exception to the general rule against carrying firearms in federal facilities applies to firearms that are "incident to" lawful hunting or other lawful purposes. We can replace the words "incident to" with "necessary for" and you get a clearer picture.
Firearms are required for hunting (except bow season) unless you are really really fast and can run down your prey and stab it, so they are "incident to" lawful hunting. The same cannot be said for a CHL carrying in a post office. Having a gun on your side is not "incident to" any other lawful purpose such as buying stamps, shipping a package, checking a PO box, or anything else you're going to do in a post office. Some have argued that you are carrying it "incident to" lawful self-defense, but this argument fails because you are not engaged in self-defense when you walk into a Post Office. You are prepared to engage in self-defense if attacked, but you are not engaged in the act of self-defense when you enter the post office. The only way 18 U.S.C. 930(c) would apply is if you are attacked and flee into a PO with your handgun. Then you are actively engaged in the lawful act of self-defense.
The best argument will be Heller's
recognition of the Second Amendment as an individual right and its dicta
noting that self-defense is a natural and constitutionally protected right.
There is a great lesson for all activists; don't overstate our case and don't exaggerate the opposition's position. Doing so not only deceives "our people," it hurts our credibility to the vast majority of Americans who are not members of the NRA or the Brady Campaign. I have won a lot of trials because I caught a witness in a lie or an exaggeration. Once you show a jury they can't be trusted, you've taken a giant step toward winning the case, even if the facts are less than favorable for your client.
18 U.S.C. 930(c) wrote:(d) Subsection (a) shall not apply to—
(1) the lawful performance of official duties by an officer, agent, or employee of the United States, a State, or a political subdivision thereof, who is authorized by law to engage in or supervise the prevention, detection, investigation, or prosecution of any violation of law;
(2) the possession of a firearm or other dangerous weapon by a Federal official or a member of the Armed Forces if such possession is authorized by law; or
(3) the lawful carrying of firearms or other dangerous weapons in a Federal facility incident to hunting or other lawful purposes