White people are beginning to get disgusted with the bad treatment of black people by law enforcement.
Police agencies are in need of major reforms. Police need an honor code -- do not lie, cheat, or steal, and do not tolerate those among yourselves who lie, cheat, or steal -- because bad cops can no longer get away with cruel or corrupt behavior.
Both, although I don't think it's Obama's fault. (normal?)
The President has scrupulously avoided interference in local matters except in the few egregious cases that lead to civil unrest. Such has been the norm for Presidents.