Despite it being frequently used here as a shield against the inconvenient reality of historical fact, there are almost no "disciples" of the "Treasury of Virtue". The phrase is almost always used to deflect criticism by a disagreeing party, and it's worth noting that most of the time, the term "Lost Cause" is used in much the same way. Strangely, the two stem from almost the exact same intellectual failing: modern political absolutism. The shades of grey that naturally compose American history are inconvenient to the simplistic sound bites of, "The government is intrusive," or, "My country is always right and just." (Or, even more paradoxically, the all-too-common phenomenon of holding both positions at once). If someone is to view their opinions as definitive, then the study of history becomes an act of self-justification, not self-education.
We, of course, have the occasional Lost Causer drop by; the once every month or two, fly-by-night troll who blatantly lies, plagiarizes, attacks, invokes inane conspiracy theorists, and inevitably abandons the forum or gets themselves banned in their fury at being confronted by a wall of people who have no patience for someone who exploits our shared, life-long hobby as justification for their modern political agenda. I'm sure if we were to have a true adherent to the "Treasury of Virtue" or "False Cause" - or whatever you wish to call it - they, too, would find themselves confronted by a wave of accuracy.
It's worth noting, however, that anyone whose view of the war is so simplistic that they honestly think the soldiers of the north were fighting to free the slaves probably has so little interest in the war that we're not going to ever see them. For that matter, anyone who holds the idea that, "My country is always right and just," is probably going to use a different moment in our history to justify that position, for even if only one side was universally in the wrong and one side universally in the right, the people who were wrong were still Americans.