You don't say what 30.06 IS, but I'm guessing it's a "don't carry in here" sign.
I don't want anyone to get robbed, but they should be nervous about it, now that they're advertising that nobody in there is CCW.
Ask them if they have one behind the counter. If no, they don't GAS about their customers' lives. If they do, they're being hypocritical.
Tell/send them the Luby's Story.
I'd be very nervous about shopping there.
It won't be long before someone shows up there seeming to be casing the joint. If you notice any unusual activity, be sure to phone the manager after you've gone to a safe, off-premise site.
I hope (and so should the employees and customers) that when they DO get robbed, the perp is a pro instead of an anxious crackhead or gang member. There are probably more of the ones that will shoot irrationally, though.