No one needs a knife that big? It makes it a heckofa lot easier to cut inions.
Seriously though, that is just ludiocrous... banning a kitchen utensil? Anything really could be used as a weapon if you think about it... cars, horses. I know that the English are mad about horseback riding; a horse is MUCH more dangerous than most reptiles! (excluding venomous of course. Even still..)