Does a felon in possession of a firearm have the right to seek protection from the authorities?

The defense of necessity will rarely lie in a felon-in-possession case unless the ex-felon, not being engaged in criminal activity, does nothing more than grab a gun with which he or another is being threatened.... [O]nly in the most extraordinary circumstances, illustrated by United States v. Gomez, where the defendant had sought protection from the authorities without success, will the defense entitle the ex-felon to arm himself in advance of the crisis merely because he fears, however sincerely and reasonably, that he is in serious danger of deadly harm.

Id. at 737 (citation omitted).