Anyone from MN will recognize the sign. I've been thinking about this a bit today because of the recent events. Places of business put them up apparently to advertise that no one there can defend themself.
I learned today from a woman who runs a very nice charity near my home that the law actually requires her to have this sign up.
I understand in bars, but WHY would you advertise that you are defenseless anywhere else? Someone.... actually a bunch of people actually think signs like this make you safer.