I realized users (including me) are technically milking Hive, but even certain groups are butchering Hive, so I raised the idea of adding a 1% (capped at X.XXY Hive) per transfer/transaction so that any transaction will burn Hive for the benefit of Hive.

I was pointed out to the Hive Blockchain Whitepaper which was basically the single source of truth for everything Hive, on page 1 Hive = fee-less, so if to make ideas not in the whitepaper become a reality, it needs a new blockchain or the top witnesses will agree on it.

To support your idea, a separate database/blockchain could store all the blog posts/comments then based on the setting (disappearing after X days, or permanent) it will be:
(1) deleted from a centralized database forever, a foreign key is stored in the main blockchain for this; or
(2) just hidden through a special offchain encryption (maybe layer 2). Any person who forcibly access it will see garbled text unless the account owner will revert its settings to visible.

Still, it's complicated, especially when talking of blockchain since it is really decentralized ledger by definition. I remember the user anonymouser leaving because of this issue.

All of our Hive data, even if we edit our posts, are still perfectly visible to bad actors to make use of.