Sometimes governments have too much information for their own good:
Cover every square inch of the city with CCTVs and you'll get so much information that you'll never make any sense of it. Scotland Yard says that CCTVs help solve fewer than 3% of all crimes, while a study in San Francisco found that at best, criminals simply move out of camera range, while at worst they assume no one is watching. Similarly, if you take fingerprints from every person who applies for a visa or worse still, from every person in Britain who has to carry one of the proposed new biometric cards you will fill the databases with chaff that slows down searches, generates endless false matches, and threatens everyone in the database with the worst kind of identity theft.
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