I suspect we know even less than the colored blanks do.
But if the mural really is connected to that game... and King is really shutting down on Surgeon, then it's easy to assume that it's not a history that threatens the blanks so much, but threatens King himself.
In which case, our position is to protect King from those threats. For all we know, Surgeon has been attempting to use the colored blanks and this past history to manipulate blanks into over throwing King.