This response hardened the whites in their view that black people are criminally inclined and a threat to the safety of the lives and properties of whites.
Actually, the situation is far more serious than racism.
I can remember times when police in America were reliable. They had themselves under control and saw their role as helpful to citizens and investigators of crimes. They took care not to bring charges against innocent people and to kill citizens without cause. Police would put their lives on line in order to avoid making a mistake in the use of their power.
This police training, together with police incompetence, which is difficult to understand in these days of GPS addresses, results in massive assaults in the homes of totally innocent American civilians who have done no wrong, but, despite their innocence, lose family members and pets to gratuitous police violence.
Police reside in the executive branch, and since 9/11 the executive branch has succeeded in removing itself from accountability to law and to the Constitution. This unaccountability has filtered down to the militarized police who can now murder with impunity as their numerous murders of citizens are given a pass.