You are attributing the actions of extremists to a mainstream you don't like, and have ignored the question.They are lashing out at anything and anyone they imagine may be white or related to the white establishment. They are seeing everything based on race.
They have defaced numerous structures dedicated to people who fought slavery. Their outrage has led to the destruction of black owned businesses. They have executed white police officers.
Their stated goal does not match their larger rhetoric nor their actions.