I would not dismiss a crying mother's concern over police brutality here . The cops should use only as much force as necessary - and avoid pit-bull responses in a difficult arrest. Otherwise the police will be perceived - not only by the Black Lives Matter crowd - as " enemies of the people ". More than 100 years ago the great Russian revolutionary V.I. Lenin had a sober " scientific " explanation for police brutality in his pamphlet " State and Revolution ". In 1917 his Bolshevik Party seized state power in Russia. The " new police force " there was turned against the old Czarist order. In 1968 after the chaos of the Democratic National Convention in Chicago Mayor Richard Daley got it right with a now famous quote : " The policeman is not there to create disorder. The policeman is there to preserve disorder ".