11 But Alma said unto him: The Spirit constraineth me that I must not stretch forth mine hand; for behold the Lord receiveth them up unto himself, in glory; and he doth suffer that they may do this thing, or that the people may do this thing unto them, according to the hardness of their hearts, that the judgments which he shall exercise upon them in his wrath may be just; and the blood of the innocent shall stand as a witness against them, yea, and cry mightily against them at the last day.
Since the primary goal of this earth life is for us to be tested, then we should not be surprised when unpleasant things occur as a result of the agency of others. If God always intervened immediately, there would be no credible test. The person could always say, “I would have stopped at the last moment. You don’t think I would have actually burned those poor innocent people, do you?” Obviously, there are times when the Lord does intervene, including later in this chapter, when Alma and Amulek are miraculously freed from the prison. But Mormon makes it clear that the people of Ammonihah had already been tested by that point. In fact, as a final piece of evidence, the Lord did not rescue Alma and Amulek until every person in that prison had smitten them. There was no ambiguity about which side of the line they were on individually.