I mean, it’s designed to stop a bullet which delivers much more force than a human being can ever produce during stabbing
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If you step on a brick with all your weight, it won’t penetrate your foot. There’s a lot of force there, but it’s spread over a wide area.
If you have a nail sticking up through your floor and you step on the point with all your weight, it’ll easily go in the bottom of your foot and out the top. Same amount of force, but much more concentrated on a teeny little area.
The point of a knife is, ordinarily, very, very small. Because of this, the force is all concentrated on a tiny little spot, one or two fibers. A bullet is comparatively much larger, covering hundreds, maybe thousands of fibers. To get in, the bullet has to break ***through*** all those super strong fibers.
The bullet gets stopped while the knife point can wiggle and thread its way ***between*** the fibers; it doesn’t have to brute force through them, it can go between and push them apart to make a path.
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