Well, its been proven that the worst way to convince people is to attack them personally or attack their standards. The point here is that you're not preaching to the choir -- telling other knife knuts why you think knives are so great and why anyone who dislikes them is crazy -- you are trying to tell the people who like Iggy said, who have relatives or friends killed by knives, or have been mugged at knifepoint, why going about treating knives as weapons is a mistake.
I think I would two things.
The first thing I would personally do, which many people here might disagree with, is
disassociate knives with guns. I guess this is more of a not-do rather than a do. IMHO, this is a very important point. I understand that many knuts here are hunters, and therefore see the two as going hand in hand, but there are a lot of gun people who aren't knife people, and a lot of knife people who aren't gun people. I fall into the latter category. I think you can convince more people at large if you present yourself as an independent group, rather than a subset of another group. From another perspective, as Dog of War said, the anti-gun sentiment is already pretty strong, and as a knife knut I would want people to approach knives with an open mind rather than carrying deep-set prejudices over from the gun issue.
Second thing I would do, is tell people a story. There is very little that can capture people's imaginations more or win them over as much as a good story
. Excitement and passion is infectious.
I would tell them first about the history of knives and the human race. Everyone has heard the phrase "a dog is a man's best friend." I would talk about how a knife is the cornerstone upon which human civilization was built. The first tool. How, even before humankind had fire, we had knives, and how each civilization through time has used knives to carve out a place for ourselves on this earth. Like, how in Victorian times, every gentleman and many ladies carried pocketknives and it was considered a mark of distinguishment and culture. How despite all this time and all our technology, we have not found a substitute for this simplest and most elegant of tools.
Then, to the people who have been hurt or have had loved ones hurt by knives, I would say, banning knives does not solve the problem, it only makes it worse. By treating knives as weapons, when they are in fact tools that we use every day even if it is just to prepare and eat our food, they become weapons. It's a self-fulfilling prophecy. Ignorance is death --- the more you keep knives away from the ordinary man and woman, the less likely they are to understand knives and their capabilities. This means that violent criminals who misuse knives can hurt innocents more easily because they have two elements on their side: surprise, and fear of the unknown. If ordinary people are familiar with knives and their uses, it will be harder for someone to take advantage of them in that way, and less people will be inclined to misuse knives in this way. Why? Because I firmly believe that the more you value something, the less likely you are to use it in a destructive manner. It is not often you hear about someone being killed by an expensive crystal sculpture. People also do not smash other people on the head with an expensive bottle of wine.
It would be a shame to turn something that has served every human being so well for so long into something exclusively for the use of criminals
That is what I would say.
) 
aka- doing the stupid shit that got things banned in the first place.
