As for the logic involved in creating "Combat Cutlery":
As the second of four boys at mealtime, with manners that would have made wolves look like a British High Tea, I would have paid good money to have had a double barreled knife and fork when Mom served her fresh yeast rolls. It would have saved me from stab wounds and bites.
With that experience as a starting point, I'm willing to offer the idea that such flatware might have been useful for a traveler stopping off for a bite at the medievel version of Micky Dee's. I've seen movies, I know how wayside inns were.