warsaw poland president barack obama friday make impassioned plea nation address combative relationship local police force black hispanic communities serve shoot two black men police minnesota louisiana two days incidents like occur big chunk fellow citizenry feel color skin treat obama say shortly land early friday morning warsaw poland nato summit trouble us black issue hispanic issue american issue care say deaths philando castile traffic stop falcon heights minnesota alton sterling outside convenience store baton rouge louisiana late string shoot lead call revamp way police interact black community cite statistics show black likely kill police officer receive harsh sentence white counterparts obama say incumbent us say good this white house task force good police tactics issue recommendations last year improve community relations law enforcement obama encourage local police force adopt practice outline task force say less distrust police would help keep officer safe lead less deadly shoot authorities critics push reform local police tactics charge obama show enough concern police officer shoot line duty obama repeatedly stress believe police officer job without bias address complaints police brutality would undermine law enforcement people say black live matter mean blue live matter mean live matter right big concern fact data show black folks vulnerable kinds attack say early thursday obama issue facebook post urge nation address appearance reality racial bias police obama say must do address u.s. police shoot