The fifth amendment was only ever intended to be dealing with testimony - you couldn't be called as a witness against yourself (the history of why it exists makes this clear). That is, you literally can not be asked to testify against yourself, in a custodial interrogation, court, or other setting where it could be used as evidence against you in a criminal trial.
It was never intended to prevent evidence you were stupid enough to write down from being used against you.
So basically, "insane or not", the fifth was clearly not intended for this purpose, despite your attempt to view this as "an extension of yourself".
It was never intended to prevent evidence you were stupid enough to write down from being used against you.
So basically, "insane or not", the fifth was clearly not intended for this purpose, despite your attempt to view this as "an extension of yourself".