Dear Sir or Ma'am:
I am writing as a lawful gun owner, in regard to the recent robbery attempt in Milwaukee. As you may know, this is the first case of a concealed carry permit holder in Wisconsin using a firearm in self-defense.
First off, I want to applaud your decision to not press charges against the lawfully armed citizen who stopped the robbery, despite him being in violation of your store's "no gun policy."
Secondly, I want to urge you to reconsider this policy. As this incident clearly illustrates, criminals intent on committing violent acts are not stopped by policies or signs. These sorts of policies only serve to leave lawful citizens vulnerable and disarmed, giving the armed criminals an advantage.
Can you imagine how much worse this could have been, had it not been for the permit holder who (whether or not on purpose) violated your policy?
Many other companies, instead of creating these sorts of policies, simply defer to federal and state firearms laws. I hope you'll consider doing exactly that.
Thank you for your time!