In person conversation and online conversation are very different. Just like the mechanics of picking a lock and hacking computers in another country are very different.
Online conversations can be unintentionally published with mistakes (even the best of us make typos or post to the wrong chat), and the blast radius is much worse.
Online conversations are much easier to misinterpret due to lost context.
If it's a public figure or a company doing something shady, yes, it'll end up on Internet archive.
If a user wants to remove their selfie; you let them, because it's their content.