Well that is their right, and their decision should be respected. I would cross that place of your list of places to spend your hard earned money though. And I do not even think it is worth the paper, ink envelope & stamp trying to make them understand that law abiding citizens are not the ones they need to worry about.
As for the managers statement of "They are not safe" (referring to firearms)You really cannot argue with stupidity.
I wonder if those signs make the ownersand managers feel all safe and secure now because we all know criminals withintent on robbing that store will surely obey their signs that state no firearms be brought inside (Sarcasm off now)
"You just can't fix stupid"