It all comes back to the irrational premise that the possessor of a mere object, just by possessing it, is certain to do violence to another person.
Check it out:
On March 29th Breitbart News sat down with KnifeRights.org founder Doug Ritter. We discussed the growing efforts to stop and/or repeal knife control and ways in which knife control and gun control intersect.
We asked Ritter, “So how do laws banning or controlling certain types of knives about?”
Well, look at an article like the one James Oliphant wrote for National Journal. There you see the language of “deadly blades” and you see knives described as “weapons.” I am convinced the use of such phraseology is no accident. When knives are described this way it paints a picture that anyone who carries them is doing so with the intent of using them offensively.