Why are all of these deaths of black people at the hands of police suddenly huge news? It's not like the situation is any worse now than it has been in the past. In fact, I'd bet that it's gotten much better.
However, Al Sharpton has let the cat out of the bag. Occasionally morons like him let slip the real reason behind their actions.
The Leftists, as they always eventually do, want a Nationalized Police Force. It is much too hard to have complete, jackbooted control over the population when you're not controlling the people who are controlling the people. And many of these local hick cops may actually sympathize with their local citizens! That is unacceptable to the control-freak Left.
The Feds have already armed local police forces using the Federal 1033 program, putting military hardware on the streets of your town (you can use that link to see what the military has given to your town). The logical next step is to take control of it. I'm sure it makes the Lefties nervous to have that stuff out there and not be in control of it.
We've seen what happens when a country implements a national police force: