[@Lovejoy] Come to think of it, would the ruling houses of a surrendering nation -- particularly T'sarae -- have been slaughtered in the first place?  Then again, it might be spoken of as a slaughter, and recorded that way (history written by the victors, etc) and in reality the members not taken as slaves were just kept as "guests" (read: prisoners) and otherwise kept from having further children.  It'd put an effective end to the family outside of the Scarlet House, and over time the truth would be forgotten.

It's more an academic point than anything else, though.