@yerrag
As a lifelong student of history, rewriting and erasing is visceral.
Large smear campaigns are bad enough but the time to really worry are when names and bodies of work begin to disappear (has anyone tried to research Gilbert Ling a second time lately, without resorting to books?). I can name and discuss estoric historical examples all day long.
The web and digital are both great and terrible places to store information btw.