Coriolanus and Clemensia might not think highly of the tributes’ lives, but they do imply that Arachne’s death is a steep cost—and that, perhaps, if Panem values its Capitol citizens’ lives, it shouldn’t hold the Hunger Games. Keep in mind that they’ve been raised to value their own lives over those of the tributes, so this view makes sense and is, in this context, surprisingly humane. They don’t want anyone they care about to die.