Ever read
The Bonfire of the Vanities? These are called by prosecutors Great White Whale cases, and are pursued with utmost gusto. They all want a chance to put a White person behind bars for murdering an innocent black person. The chance is extremely rare, and can be a career maker. The MSM is 100% behind this effort, too, whenever it appears to be a possibility.
Que Governor Roy Cooper. He did his best to fry Officer Karrick, a Charlotte police officer, after an incident in 2013. Cooper was the N.C. Attorney General at the time. He sent the case to Grand Jury twice, if I remember correctly. His efforts were clearly political. Most local law enforcement hates his guts.