The main issue with this is that they are not banning a specific item, they are banning a shape, or set of innate physical properties.
You cannot ban things with the properties of ‘pointy’ or ‘sharp’, these can be made easily out of any kind of rigid material. Glass, sticks, stones, plastic, blunt metal objects and so on and so forth.
To make a firearm and ammo you need specialist tools, specific materials and controllable substances.
To make a knife or stabbing implement you just need anything that is rigid and something to scrape it on to make it sharp, such as the floor or a rock. Or just break something that isn’t sharp to give a sharp broken edge.
You cannot ban things with the properties of ‘pointy’ or ‘sharp’, these can be made easily out of any kind of rigid material. Glass, sticks, stones, plastic, blunt metal objects and so on and so forth.
To make a firearm and ammo you need specialist tools, specific materials and controllable substances.
To make a knife or stabbing implement you just need anything that is rigid and something to scrape it on to make it sharp, such as the floor or a rock. Or just break something that isn’t sharp to give a sharp broken edge.