A passing conversation isn't a permanent record, though. Aside from memory, it's not stored ad infinitum. Moreover, if abuse/harassment occurs, such as the canceling thing, it boils down to hearsay.

None of that is even remotely true without edits and deletion.

Transparency for governments, corporations, money and software. Privacy for the people.  

 Good points. Thank you. I do think that more thought before posting would be a good idea for many. Absolutely agree,  Privacy for the people.