I feel that deleting or autodeleting leads to a false sense of security, in fact it might draw more attention if something disappears.

Several people on Mastodon delete their old toots. Here a blog post from a well-known person on Mastodon with their reasons : https://kevq.uk/why-i-delete-old-content/

excerpt : I also wouldn’t want something I’ve said years ago be taken out of context (or taken correctly, but I’ve changed my opinion since). So it’s easier to delete my shizzle.