Why so many black americans mistrust the medical system and blacks vote democrat still....

He never answered the question "why Blacks still vote Democrat". Certainly you had Democrats running the US government during this time of abuse!! For example, Woodrow Wilson 28th president (D) wanted the Blacks sterilized and supported Margaret Sanger sterilizing campaign as blacks being undesirables. In addition, Democrats gifts to the Blacks, KKK, Jim Crow laws, Poll taxes, blocking 1963 civil rights Act.
My guess as to why they support Dems:
LBJ and the Democrats gave them welfare. And the Marxists that took over the DNC have much better propaganda for the last 75 years to wash away their sins.