Do you read? The crime was committed IN PERU. The fact that the victims are American is irrelevant. Jurisdiction should be Peru, not a fascist superpower.
Believe me, prisons are no picnic in Peru, better off keeping him there, perhaps they’ll finish the job next time.
Besides, if he's physically in Peru but using telephones, etc., to commit fraud and extortion against persons in the USA, the USA has every right to go after him. If some foreigner were committing extortion against you, you would say the same thing.