It is probably something like this: When I moved to the US we were living in Northern Virginia in Fairfax County, one of the most affluent counties in the US where the Pentagon and the CIA headquarters are located. Quantico the FBI training facilities are also in Virginia so it is not "Hicksville" in southern Virginia full of rednecks. I was on my way home and I used to stop and rent some movies at the end of the week. It was just 2 stone throws away from our house. The video store was called Hollywood Video. I went into the store, I had purchased something from a nearby RadioShack and I had my backpack on. I started browsing films then a young black guy came into the store, he was nicely dressed and looked like a college guy. Immediately the staff told him to give them the backpack whereas another white guy also had a backpack and nobody told us. So 2 white guys with backpacks, one black guy and they told him to give them the backpack. The other white guy got upset and asked them why they hadn't asked us, they had no answer. When I was hired as a consultant for 2 weeks at Microsoft in 2006 one of the Excel developers we worked with was black and one night we all went out for drinks and he told me that every time he was at a red light and he saw a police car coming up to stop he always lowered the volume in his car just to not provoke anything from the cop.
Then we have Susan Smith in South Carolina, infamous child murderess who drowned he own 2 sons (one was 3 year and the other was 14 months) because she had met a guy that was rich and wasn't interested in kids so she had driven her car into a pond and drowned them. When the cops interviewed her she said that her car had been carjacked by a black man. For about 2 weeks she appealed on TV asking for her children and then the found the car, she had also said that she was the only car stopping at the red light but it was a newer type of traffic signal and she could only get red light if there was a car at the intersection.
Just recently (in May) there was a woman in Florida who drowned her autistic son.
"It was Thursday night when Ripley called police with a dramatic and bizarre tale: A light-blue car forced her car off the road near a West Kendall Home Depot. Two black men were inside. One of men jumped out, she told Miami-Dade police, and demanded drugs.
When she told them she didn’t have any, the man — armed with a knife — took the child, her cell phone and a tablet and drove off."
They actually found a video of the murder and another video earlier on the same night where she had tried to do it but a good Samaritan had rescued the kid and later she went to another canal.
"And authorities said the murder was well-planned — she actually tried drowning Alejando earlier Thursday night, but was thwarted when a good Samaritan stepped in and rescued the boy from the water.
“An hour later, she brought the boy to a different canal ... this time, there was no one there to save him,” Miami-Dade State Attorney Katherine Fernandez Rundle said at a Saturday morning press conference."