The police of a state should never be stronger or better armed than the citizenry. An armed citizenry, willing to fight, is the foundation of civil freedom.
Robert A Heinlein
Beyond this Horizon
[This is the same character in the same book which made this famous quote.
Also, from here:
This should be intuitively obvious to the most casual observer of the 20th Century. But somehow many people have not done much observing and/or have no interest in civil freedom.—Joe]