I could get behind a delete.
Discussion
Once you sign and publish a payload, there is no way back :)
IMO a public key self destruction would be nice too. Sign a message and the relays delete/filter out any messages from there on out. Might come in handy if your private key is compromised or some other scenario.
i actually really like this use case as well. it would be nice to run a dump of all followers and following pubkeys prior to destruction too.
I found out today follows are client side... Currently using astral.ninja and you can see all your local data including follows in the chrome dev tools. Go to application, local storage, astrial.ninja. There you can grab config, keys, follows and relays.