The cops relent and come back.
The crime rate goes down.
As sure as the sun sets in the west, another incident will arise.
Once again the cops will be blamed for the actions that gets some thug killed.
The cops will back off again.
The crime rate will rise again.
The citizens of Baltimore will once again demand the cops come back and protect them.
Some people aren't smart enough to see larger patterns in human social interaction. Generally these people are Democrats who voted for Obama.