He killed all those people -- every male. They had…

““He killed all those people -- every male. They had offended the Deity in some way. We know what the offense was, without looking; that is to say, we know it was a trifle; some small thing that no one but a god would attach any importance to. It is more than likely that a Midianite had been duplicating the conduct of one Onan, who was commanded to "go into his brother's wife" -- which he did; but instead of finishing, "he spilled it on the ground." The Lord slew Onan for that, for the lord could never abide indelicacy… Some Midianite must have repeated Onan's act, and brought that dire disaster upon his nation. If that was not the indelicacy that outraged the feelings of the Deity, then I know what it was: some Midianite had been pissing against the wall. I am sure of it, for that was an impropriety which the Source of all Etiquette never could stand. A person could piss against a tree, he could piss on his mother, he could piss on his own breeches, and get off, but he must not piss against the wall -- that would be going quite too far. The origin of the divine prejudice against this humble crime is not stated; but we know that the prejudice was very strong -- so strong that nothing but a wholesale massacre of the people inhabiting the region where the wall was defiled could satisfy the Deity.””

— Mark Twain