FirstGod, well, its just like all history - there is prevailing narrative (of victors who write history), so to say.
Generaly in so called anglosaxon world (and this is VERY culturaly and otherwise influentual part of world), redcoats are more or less "good guys" and all that follows. They won war and others just hepled them a little. Indeed in other countries who took part in napoleonic wars we have other narratives, but they are far less infueltual.
Truth always somewhere in middle. But no one likes it there.
Its just all how human nature and nature of states works. This is normal. And games are products of age and all this historical/cultural narratives/current trends in society. And here comes all kinds of double standards. Like [almost] everyone happy with endless brutal killing of german/japanesse soldiers in WW2 settings (certifed forever "bad guys"), but if you make AAA game and call it lets say "Slave trader"... RPG about character who raids Africa and kill and capture black people to sell them for profit in Americas (absolutly 200% historical thing), you will be flayed alive, burned, beheaded and hanged as demonic, unhuman rasist.
Sorrry for offtop, this is interesting topic. About historical mythology and modern society.
P.S. But Holdfast is nice neutral game in all this, by the way. With respect to all sides.