It’s worth noting, given rioting and flash mobs, that under Pennsylvania law:
(1)Â Â The use of force upon or toward the person of another is justifiable when the actor believes that such force is immediately necessary to prevent such other person from committing suicide, inflicting serious bodily injury upon himself, committing or consummating the commission of a crime involving or threatening bodily injury, damage to or loss of property or a breach of the peace, except that:
(i)Â Â Any limitations imposed by the other provisions of this chapter on the justifiable use of force in self-protection, for the protection of others, the protection of property, the effectuation of an arrest or the prevention of an escape from custody shall apply notwithstanding the criminality of the conduct against which such force is used.
(ii)Â Â The use of deadly force is not in any event justifiable under this subsection unless:
(A)Â Â the actor believes that there is a substantial risk that the person whom he seeks to prevent from committing a crime will cause death or serious bodily injury to another unless the commission or the consummation of the crime is prevented and that the use of such force presents no substantial risk of injury to innocent persons; or
(B)Â Â the actor believes that the use of such force is necessary to suppress a riot or mutiny after the rioters or mutineers have been ordered to disperse and warned, in any particular manner that the law may require, that such force will be used if they do not obey.
(2)Â Â The justification afforded by this subsection extends to the use of confinement as preventive force only if the actor takes all reasonable measures to terminate the confinement as soon as he knows that he safely can, unless the person confined has been arrested on a charge of crime.
Emphasis is mine. I’ve always taken this section to mean that it’s lawful to use deadly force to disperse rioters, provided the law is followed in this case. I don’t know what “any particular manner the law may require” might mean, and it would not surprise me if no one else knows either. Would this mean putting up a sign in front of your store, during a riot, warning that looters will be shot would suffice as legal warning under this statute? This section is in a part of Pennsylvania law outline the use of force in law enforcement, but this particular section does not limit itself to peace officers.
Generally speaking, I wouldn’t suggest treating any mob or riot situation like a free fire zone; escape is the best strategy if possible. But if not, this statute may provide you with more legal protection in the event you have to shoot your way out of a violent mob, and the government decides they don’t like you trying to survive without their good help. It’s good, at least, to know it’s there.