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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Kevlar bulletproof vests are made of many layers of fabric (Kevlar) that are very strong against forces which pull them. The layers are sewn tight together, so that when something impacts them, the Kevlar is stretched by the impact. When a bullet impacts the vest, each layer has to sequentially stretch until it goes past it’s breaking point before the bullet can go through. Once a layer is broken, it loses all of its strength. That’s why bullet proof vests are a one time defense.
Knives are sharp enough that the blade can fairly easily cut the fabric. They still put up a lot of resistance, but Kevlar is not great against cutting.
A knife attack also tends to be repeated stabs at very close range in the same area. Most guns are either very accurate but take a while to aim, or they fire rapidly and are much less accurate. As I mentioned earlier, once the vest is damaged, it is completely ineffective. Getting shot from distance once gives you time to take cover. Getting stabbed usually means multiple stabs before you have a chance to get away.
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