So... on one hand we have African terrorists calling for armed attacks on malls in the USA -- attacks like the terror at a big American-style mall in Kenya last year where a handful of open-carry enthusiasts used assault rifles to murder 63 people (including mothers and children) and wound 175.
On the other hand we have the NRA and its Republican friends (and what Republican isn't a friend to the NRA?) agitating for the right of Americans to walk anywhere in the United States carrying their "constitutionally-protected" M-15's with them wherever they go.
Will a public terrified at the prospect of terrorists shooting up the local Mall feel comfortable when the public space around that mall is filled with dozens strangers carrying weapons of individual destruction?
The "terrists" have recruited followers who look more like David Duke than Osama bin Laden -- so what to do when people looking like like David Duke turn up at shopping malls with big gins and with patriotic lapel pins. How does a patriotic mall visitor tell the pasty-faced open-carry jihadist from the pasty-faced open-carry NRA member who is just out exercising his 2nd Amendment rights.
How's a person to know which open-carrier gets a brotherly head-nod and which one gets a bullet to the head? And what happens the first time some idiot tragically guesses wrong?
The only way to stop a bad guy with a gun is have a bunch of good guys carrying guns walk around without badges or uniforms or law-enforcement training or any rules-of-engagement besides "stand-your-ground" laws. What could possibly go wrong?