After several discussions on this topic, I felt it best to present my personal view on the subject…
People, after examining the Class D system, invariably ask the question: "where do they all come from?". It then normally evolves in to a rejection of the presented policy, and requests to edit/review how the Class D are handled. However, this skips over what i feel is a rather large point.
Examine this: The Class D are very bad people, who get used against even worse things. They may die, but they are all horrible rapists, murderers, and child molesters, so it's hard to feel too bad about it. Then, at the end of the month, we clean out all the scum we have left, and bring in a new batch, all for the greater good of Humanity.
Does this sound like Foundation policy, or something to help people deal?
How many actual conversations are held with the Class D, besides post-test interviews? Has anyone actually seen the end-of-month terminations? Who can actually confirm with 100% certainty that they are all scum-of-the-earth inmates?
Someone once measured out the total amount of Class-D needed per-month, and it was pretty damn high. However…how many people vanish in a month? I mean just drop off the planet, never to be seen again? How many people die in accidents so bad, they can't be identified by family, or have closed-casket funerals? How many homeless or "off the grid" people are there in the world, who could vanish with little/no notice?
Who's to say that unused Class D are not shuffled around between sites? Who knows what they are being told? Who is to say that the whole system isn't set up to help maintain emotional detachment: "This is horrible, but they were going to die anyway, so it's ok."
I think the actual mechanism behind the Class D is something that is found out only after long time employment. Once you've gotten deep enough that a little thing like a shard of the truth won't hurt as much…
Or, it's just a cheap trick to try and bump up the horror of entries, and the bad people get used on bad things for the greater Good.
Whatever helps you sleep nights.