[quote=@Etcetera]
<Snipped quote by DarkwolfX37>

How do you identify the specific weakness of any given category? And how are you confident that it will always be correct?
[/quote]

Luckily, people have done that work for us. And it's sort of like how you're confident that a homo sapiens will have a weakness to head injuries, or that a bird will be heavily affected by a wing injury. It's in their "design" so to speak.