Again, in this mode of play, the player simply isn't assumed to be able to set an agenda that extensive into the setting. You can certainly have the agenda of wanting to find your brother, but what is going on with your brother is under the purview of the GM. Obviously in a game where that isn't a case, it might be a dick move if the player is expected to have that sort of agenda. Why people can't even entertain the thought of this, and see how for lots of people operating under this style of play, it isn't at all a dick move, I really can't understand.