The [Scribble] command makes a response permanently unavailable. The text is actually overwritten with junk. Not even the system administrator can read it.
Only the conference host or the user who posted the response may scribble it. Since this action is irrevocable, it requires a confirmation.
Generally, conference hosts use [Scribble] only in the gravest extreme, the classic example being a post containing someone's credit card number or password. For posts that are merely annoying, the host should probably not risk the uproar that a [Scribble] causes and use [Hide] instead. Or better yet, grit teeth and practice tolerance.