This is indeed getting dangerously political now, and many of these topics have been done to death on JB before now, but........
I decided to buy the detector after being blinded by a speed camera facing me on a straight road one night, shortly before a bend. A combination of physical blinding and my annoyance at thinking of the consequences of the flashes almost caused me to come to a sticky end on the corner. This incident, whcih occured on a country road in the middle of nowhere, made me seriously doubt their desciption as 'safety' cameras.