The reason this one's got traction is because it's "spectacular" in the news sense - thousands of people watched an attractive young woman die live on TV, and then millions watched it be rebroadcast and posted all over the internet. It's shocking, and that shock can be used to turn opinion if nobody's presenting the facts to counter it.
They'd better be careful - they're re-emphasizing the narrative of the "dangerous black man" to white men and women.
Of course, your view could be "that's what they WANT!"