"Only 4% of all American police arrests are for crimes considered “violent” by the FBI, even though those crimes are offered as the justification for enormous public expenditures, wholesale Orwellian surveillance, and every violent aspect of modern policing." source: TFA

When it comes to the disparity in non-violent arrests, remember that whites are more likely to abuse drugs than blacks

http://healthland.time.com/2011/11/07/study-whites-more-like...

when you control for socioeconomic status.