The argument against knives is clear -- but then, shouldn't Japanese chopsticks be banned also? They are tough, smooth, and pointed. A strong man could jam one into the chest and have it stick out of the back.
Millions of people have these in their homes. As my wife is Japanese, we probably have 50 or more in our kitchen. My wife uses only chopsticks to eat; so a ban on them would amount to a starvation sentence. Also, we have several pairs of cooking chopsticks, equally pointy but quite a bit longer than eating chopsticks. If those were banned also, my wife could no longer cook, and I might starve along with her.
There are plenty of items in any home which could be grabbed in a moment of passion, and used as a weapon. Screwdrivers are an obvious example; and many people keep two or more screwdrives (regular and Phillips) in a kitchen drawer.
And in the hutch in many dining rooms, there is the sharpening steel for the (evidently soon to be banned) carving set. That is long, narrow, pointed, and has a comfortable handle. An ideal stabbing sword. Does that have to go also?
As I look about my kitchen, I spy the broom. Do you know how fast a broom handle can be broken across the knee, producing a very large and very sharp splinter. With that, one could kill a wife or husband even if they were a vampire.
Then there are my umbrellas. We keep two of them close to the back door. In case you never noticed, there is a spike sticking out of the top; and they have strong, comfortable handles. Possibly one could not stab as deeply with an umbrella as a bucher knife, but the thrust could nevertheless be just as fatal.
Then we have the cleaver. You can't stab someone through the heart with a cleaver, but a good whack will split a skull right down to the Adam's apple.
The notion of banning knives, because they can be seized and used as weapons to commit great harm in a moment of passion, is just absurd. There is no end to the alternatives one can find. Trying to ban kitchen utensils for everyone, because a few lunatics might use them as lethal weapons, is utterly senseless.