http://icrapoport.com/events/visa-pour-limage-perpignan-france/ 
The police in and around Ferguson have shot and killed twice as many people in the past two weeks (Mr Brown plus one other) as the police in Japan, a nation of 127m, have shot and killed in the past six years. Nationwide, America’s police kill roughly one person a day (see chart).
This is not because they are trigger-happy but because they are nervous. The citizens they encounter have perhaps 300m guns between them, so a cop never knows whether the hand in a suspect’s pocket is gripping a Glock. This will not change soon. Even mild gun-controls laws tend to fail.
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Source: www.economist.com