The grievances from the 50s and 60s resulted from the fact that, until that point, small rural, Democrat-dominated towns (not even sure Ferguson was one of them) used Jim Crow laws and other government power to disenfranchise blacks and terrorize blacks to keep Democrats in power because blacks used to vote Republican.
Now, the Democrats are using the legacy of hate and oppression that they created to maintain power again. And, just as they did in the past, they are staying in power by creating a poisonous system that hurts the country and the people.
It’s not likely they will stop..its been working for them f or a long time.