I'm personally hoping that Kamui is a, well... not the most legitimate child of the Hoshindo family, and was thus thrown away as a political prisoner to SaintKing Garon. After all, he is a freaking manakete, which kind of makes it hard to believe he shares the same mother and father with the rest of his siblings. Futhermore, if we make Hoshindo a peaceful but racist group of people who all hate dragons... well that would certainly make the choice less cut and dry from a meta perspective. Go with the group of peaceful guys who happen to hate your guts and jeer at you but have the more "Righteous" cause, or stick with the family which raised you ever since you were a baby and willingly accepts anyone who is capable but happens to be on the verge of going full imperialism on every nation in the world.
It's probably not going to end that way. Its a japanese company, so I doubt that they would ever really paint not-Japan in an unfavorable light.
Either way, I'm going to stick with the Nohr path. I don't really feel the "Japanese peaceful awesome-sauce clan" which can do no wrong. So... ah, Nohr. Let's go with your actual family, shall we Kamui?
Team NOHR! Because evil is worth it.