Yurt, don't be silly. Come knock on my door - I'll sell you a gun. Or, answer an ad on line. Or go to certain gun shows. Anyone can buy a gun and anyone can carry it "concealed" if they want to.
But, I'll give the nutters this: In some ways, it really does make sense to be armed at all times. If Trayvon had been armed, he would not have been screaming for his life like a helpless little kid. He would have been able to defend himself against the guy who DID have a gun and he would have know it.
IMO, every person who carries a gun is just hoping and waiting for the opportunity to play Mighty Mouse and swoop down to "save the day". People (especially men) who feel impotent and small, at the mercy of outside forces such as their boss, spouse, etc, those are the people who are so scared of the world that they carry a gun. Zimmerman, with his cop wannabe phone calls to 911 fits that description. He needed to feel important. Watch him right now in the courtroom. The stupid fool looks like Ted Bundy in that he's just thrilled to be the center of attention.
BUT, even if Zimmerman did not plan to kill somebody that night, he knew he could if he wanted to. He had no reason to scream for help because he knew he could defend himself.
The person who had no defense - Trayvon - had very good reason to scream. He also had every right to "stand his ground" against the guy who was stalking him and he had every right to fight for his life. Sadly, he didn't know that the guy who was stalking him was armed and hoping for the chance to prove he's a Real Man.
No matter what else you believe about this case, one person had a gun and the other did not. There was never any question about who was gonna live and who was gonna die.