It's reassuring to hear that self-defense, or defense of one's family, neighbour, or nation, is not impossible under Christianity. But consider this case: I met a man once, who claimed to take Matthew 5:39
5:39 But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.
seriously to the point of not resisting any evil in any way. I asked him what he would do if he had a gun, and a man with a gun threatened his family. He said he would throw down his gun. Is this man misled?