It is for the same reason that you cannot delete emails.
nostr:npub180cvv07tjdrrgpa0j7j7tmnyl2yr6yr7l8j4s3evf6u64th6gkwsyjh6w6 Can you explain why we can’t delete notes? nostr:npub1579pvlu8z8zjehkmudeshsfkgwgtjm72ydalhygl5cdmnyglezeqs2rkxm getting pissed everytime, but I can’t explain why it’s work that way. I’m not a technical person.
Discussion
That's a great comparison actually.