Yeah, but knives have a wide range of use, whereas guns do not.
You cannot buy a kitchen knife because people MAY use it cause harm.
It is like forbidding the use of roads because it MAY be used to <insert illegal activity here>. Uses (usage?) of roads are even more broad than uses of knives.
I think it is easier to argue in favor of knives (or against the prohibition of ... of knives) than guns, for this reason alone.
You cannot buy a kitchen knife because people MAY use it cause harm.
It is like forbidding the use of roads because it MAY be used to <insert illegal activity here>. Uses (usage?) of roads are even more broad than uses of knives.
I think it is easier to argue in favor of knives (or against the prohibition of ... of knives) than guns, for this reason alone.