Not all that kills has a sharp edge. This is an original weapon from a man who served in the SOE in the CBI theater. Stabbing weapons like this are clearly non-utilitarian and serve only one purpose, the silent elimination of enemy combatants. I have other weapons in my overall collection that are without an edge. One of the deadliest is a long needle-like tool that came in a set of awls and hooked tools. It is shown in the photo below.
Here are some non-edged weapons in my collection. They are odds and ends that appealed to me. The photo on the left show some traditional Japanese weapons (direct from Japan) usually associated with Ninjitsu, although Samurai could have also employed them. The weighted chain (Kusari) is a definite deterrent even for a swordsman. I have not tried out the darts yet but now the weather is nice I will have to do so. Kusari were sometimes married with a kama, which created a Kusarigama, a sickle with weighted chain to ensnare one's enemy. I suspect I could seriously hurt myself trying to learn how to use one of them.
The black talon like knife on the left is not sharp. The maker says it is supposed to duplicate the "Tine" daggers of WW-II. It is a nicely made weapon but clearly is a far cry from the WW-II version. These were crudely made from the tines of a pitchfork with a cord wrapped handle. The pointy weapon on the far right is very nicely made and lethal. Second from the right is a modern weapon with 3-sided blade and a artistically sculpted skull pommel.
You can find out more about me on the "Stories" pages. My hobbies have included training in Japanese martial arts, including Kenjutsu, many forms of knife fighting, long range rifles and tactical firearms. I have written several self published books on muzzle-loading firearms, knife-fighting and textbooks on gas engines and compressors. I am working diligently on my 400+ page F-S book.