Is it just to wage a war to unseat a King who is an usurper, but a good king nonetheless ? If in an AU, Joffrey, Cersei & Tywin had been benevolent people (minus trying to pass off incest spawn as true heirs) would Stannis still have been correct in starting a war to claim his birthright ? Sure he is being cheated, but is he right in triggering a war that would claim lives of thousands who could have lived happily under the false-but-benevolent King Jofferey for the sake of his inheritance?