Well, Traveler, I see you have logged in, but you still don't feel like answering the original question, oh well.
A logical answer would have been, "Hmm, I never thought about what it means to make a new policy retroactive."
"I now understand the point you have brought up, this new policy IS retroactively being forced upon all old posts."
"I agree that no new policy should be retroactively forced upon actions that were made before the policy was posted."
"So, even though it is embarrassing to agree with Ya, in the name of logic I hereby make the new policy NON-retroactive."
"This means that all posts made after the new policy was posted are subject to the new policy, not the posts made before."
"The posts which seem integral to us that were posted before the new policy was posted, can NOT be forced to be kept."
"The posts which seem integral to us that were posted after the new policy was posted, CAN be forced to be kept. OK?"