Berk said:
They still have an intelligence.
They still have a wisdom.
They still have a charisma.
Being unconscious doesn't effect your intellect, your acquired knowledge, or your influence of others. Just because you are unconscious you aren't an object, now if you were dead then you would be an object. =o)
As I was trying to say in my post, they still have the same Int, Cha, Wis, Str,
Dex and Con altogether, they are not damaged at all, they
are treated as having Dex 0 because they can't use it (can't dodge, can't aim, can't use reflexes...).
In exactly the same way you can say they
are treated as having Int 0 for example because they can't cast Wiz spells, can't recall Knowledge, can't think, can't remember, can't learn skills...
In exactly the same way you can say they
are treated as having Cha 0 for example because they can't interact with other people, can't Bluff...
In exactly the same way you can say they
are treated as having Wis 0 for example because they can't spot, can't listen (although they may unconsciously hear something), can't cast Divine spells, can't sense motive...
In exactly the same way you can say they
are treated as having Str 0 for example because they can't exert any force, can't fight...
Constitution is the only different thing: except for Concentration (which you don't need when unconscious), Constitution is generally used as a reactive ability, and since your metabolism still function, you can still be poisoned, you can still resist a spell that requires a Fort save, you still have extra hp to your total (although you're below 0 so you don't care at all

)...
These were just my ideas, but you don't really need to know all this, and in fact there's no mention in the rule, I was just extrapolating

. It was important they mentioned Dex because you can still be attacked and in the case it should have been made clear that you could not dodge at all.