Who is a bigger traitor then?
Sylvanus who wants to destroy the very society she was given control of, lies to its people in huge ways, starts a war for the purpose of pursuing her personal agenda of the annihilation of all life, including the lives of the forsaken and the rest of the horde, and unnecessarily sacrifices its soldiers at the battle of Lordaeron (she could have given them all gas masks, but didn’t).
Or Saurfang, for realizing that person had to be stopped and working with the Alliance to stop it?
I have a difficult time supporting the argument that Saurfang was somehow a bigger traitor than Sylvanus was.
Just because a person is the leader doesn’t mean they can’t betray the people she led. A leader like that doesn’t deserve loyalty from anyone.