Pretty much the whole of the Horde has turned their backs on her. The only reason others obey her is because they have no choice
If I can recall correctly, at the Culling of Stratholme. When Arthas was confronted, after being told he was no longer a Paladin Uther and Jaina walked away! and left him to slaughter the populace.
They were entirely complicit in the action as they took no approach to prevent it.