This is a good question, and one I've been wondering about.
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http://gunowners.org/sk0503.htm
The Police: No Duty To Protect Individuals
The Court in DeShaney held that no duty arose because of a "special relationship, " concluding that Constitutional duties of care and protection only exist as to certain individuals, such as incarcerated prisoners, involuntarily committed mental patients and others restrained against their will and therefore unable to protect themselves. "The affirmative duty to protect arises not from the State’s knowledge of the individual’s predicament or from its expressions of intent to help him, but from the limitation which it has imposed on his freedom to act on his own behalf."
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One of the leading cases on this point dates way back into the 1950s. [11] A certain Ms. Riss was being harassed by a former boyfriend, in a familiar pattern of increasingly violent threats. She went to the police for help many times, but was always rebuffed. Desperate because she could not get police protection, she applied for a gun permit, but was refused that as well. On the eve of her engagement party she and her mother went to the police one last time pleading for protection against what they were certain was a serious and dangerous threat. And one last time the police refused. As she was leaving the party, her former boyfriend threw acid in her face, blinding and permanently disfiguring her.
Her case against the City of New York for failing to protect her was, not surprisingly, unsuccessful. The lone dissenting justice of New York’s high court wrote in his opinion: "What makes the City’s position [denying any obligation to protect the woman] particularly difficult to understand is that, in conformity to the dictates of the law [she] did not carry any weapon for self-defense. Thus, by a rather bitter irony she was required to rely for protection on the City of New York which now denies all responsibility to her." [12]
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Has anybody tried suing based on the Riss and DeShaney cases, in a gun-ban city?
The city or a "gun free zone" business makes it impossible to protect themselves by disarming them, then claims no responsibility for protecting citizens who follow that law?