Maybe somebody should print some handbills or something, similar to how gun-rights advocates print up micro editions of our Constitution.
1.) Knives are not weapons. They are tools. A tool is an item designed to perform a task. Sometimes that task is very specific and sometimes it is very broad. Hammers, knitting needles, fingernail clippers, and catching mitts are all tools. Tools give us capabilities that we would not otherwise have. A weapon is a tool which is used to cause injury. "Weapons" are a sub-type, or a smaller group within that of "tools". Some types of tools are specially designed to cause injury, to be weapons, like swords. Other times, a weapon is merely a tool that is used in a way it wasn't designed to be used, like baseball bats. The difference between a weapon and a tool in everyday life is that of intended use. A four-door sedan has a potential to cause injury and death, but that is not its purpose, and if used this way deliberately it is a corruption of the intended use. Versus an armored tank, which is designed and intended to be used in battle. A sedan is a useful tool, a tank is a deadly weapon. A knife could be used as a weapon to cause injury, but that is not its intended purpose.
2.) A desire to carry a knife is not a desire to be armed. Some types of knives are designed to be useful as weapons, but most are not. In fact most knives make very poor weapons. People carry knives to perform useful work, such as opening packages, preparing food, or trimming material. For these people, a knife is as much a part of their everyday "toolkit" as are a cellphone, a wallet, or a watch.
3.) Those who carry knives openly are not the ones to be wary of. Those who carry knives as weapons, who intend to cause harm or threaten it, carry them hidden. People who wear a knife on their belt or around their neck, visible to the world and ready at hand, are showing you that they have nothing to hide. A hunter, who has nothing to hide and has done nothing wrong with his gun, carries it in his arms. The criminal wears their gun under their coat where people will not see it.
(continue if desired)