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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It’s mostly because of how bullet resistant vests (BRVs) work. As weird as it sounds, they’re actually designed to break.
The idea is that when you shoot a bullet, it smacks into the BRV, which spreads the energy of that bullet across a larger area.
How they do that varies on design, but in some cases, it’s just a ceramic plate that shatters on impact, and spreads the energy across the cracks
In essence, they turn a 9mm bullet wound into a bicycle-crash wound. The energy is being spread across all of your torso instead of a single small hole.
Now, what’s the difference between a bullet and a knife? Once a bullet leaves the gun, there’s nothing pushing it forward.
A knife is constantly being pushed forward by the hand that holds it. So it smacks into the vest, and the stabber can just keep pushing his hand forward.
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