PROFESSOR -- "... A dog would have probably been their best defense."
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I certainly agree that a dog would have been a good defense, BUT, only if they had been armed. Given the obvious intent of the murderer, meaning to kill the campers anyway, he'd have shot the barking dog, and then proceeded to the campers. That barking dog, and then the shot(s) would have given the campers warning that someone meant them great harm, and it was time to unlimber their artillery against their attacker. Those few seconds of warning MIGHT have made the outcome of the attack, different.
WITHOUT a firearm, however, it would not have mattered if a dog had been present, or not. Dead dog and dead campers.
As with several other posters, I doubt very seriously that the two "very religious" campers ever had a thought whatsoever in their heads regarding "self defense."
What's that old saying?? "The good Lord helps those who help themselves."
L.W.