Lost Cause hyperbole aside, it would have meant that they wouldn't need to care what the losing side thought.
Since you consider the "Lost Cause" as nothing but a bunch of slave owning fascists duping their redneck citizens in an unjust war, I ask you the following; Does it follow then, in your distorted and dictatorial style, if the Third Reich had conquered Europe and won WWII that would have been vindication for them, also?
You're a funny, funny guy.
Sorry but that would be YOU!
If you don't like the question refuse to answer and come up with some childish quip instead!