After Germany's Chaos Computer Club's (CCC) published the fingerprints of the German minister of the Interior, Wolfgang Schäuble, Schäuble said that everybody might know his biometric data, because he has nothing to fear from anybody. (Source)
Obviously, Mr. Schäuble didn't get it. Let's assume there's a burglary in your neighbourhood and Schäuble's fingerprints are widely scattered on the walls, on the furnitures, whatever. Let's assume further that he can't prove he was in bed that night. What would usually happen? The handcuffs would click within seconds. Biometric data don't lie! Nobody will misuse your data! Trust us, trust us...