Did you know that common kitchen knives can also be used by Billy Joe Bob to blind someone, or worse kill them? Just wait until you manage to tick Billy Joe Bob off. This cannot end well.
Clearly, kitchen knives should not be made, either.
Look, if people are going to attack, maim, or murder someone, they've got plenty of options already. Adding one to the potential arsenal, especially one that would take significant technical know-how to be able to turn into an actual weapon, isn't really going to change things.