The standard D20 Paladin is a warrior-priest wholly committed to the cause of Good, Law and Honour. But what about all those warriors wholly committed to other causes like Chaos, Balance, or a Nation? Thinking of historical parallels, there aren’t really any for the Paladin as written. The Warrior-priests of the Crusades and the Templars would be the closest, but that’s a very narrow focus for a class.
This revised class is an attempt to expand the range of paladins beyond that of followers of Law and Good. Although these can be laudable ideals, there is no reason why characters cannot be equally committed to other ideals.