[quote=@Sionnie]
Ethos: Alignment
Logos: Action depending on alignment
Pathos: Consequence of Action.
[/quote]

Did you even take an argument class? 
Ethos: An argument based on Ethical values. (such as the rules or laws.)
Logos: An argument based on Logical values.
Pathos: An argument based on emotional values.
[/quote]

No. 

By this logic; do you need a class in DnD to play DnD?

No.

We can throw as much hypothetical scenarios as you want, but logic dictates that they are invalid. You would have to re-work fundamental laws in society and social norms. If you have a hypothetical scenario that does not change this, then the hypothetical scenario is false and invalid.

EDIT:

In my opinion, creating hypothetical situations for the sake of seeing what happens is folly. Why worry if we are not facing that situation.