Contrast the business owner that would post that sign, with the management of Circle K stores. A Florida store was being held up by armed thugs, and one of them was urging her accomplice to shoot the clerk. The clerk reacted in defense of his life and tackled the robber. As a result the clerk was fired for his actions. Apparently Circle K considers their employees to be no more than expendable collateral, while wishing for the well-being of armed criminals.
Welcome sign available here.