I recall reading a story in the newspaper a while ago about an individual in a grocery store that was witnessing a knife attack on a woman employee in the store by, what turned out to be an estranged ex-husband. The witness, an armed man, drew his weapon and shot the woman's attacker, killing him. The woman survived in spite of several stab wounds. The man was not only not charged, but was commended for his actions. Had he not intervened the woman would be dead.
That is a difficult position to be in. Had it happened in Chicago, New York city, or our nations capitol, that good samaritan would probably still be in prison. Could you just stand there and watch that poor woman be stabbed to death?