“… this guy was as professional as they come...even calmly walking back to his car.…”
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This 23 year old dumbass was as far from professional as you can get. Professionals rarely get caught and they certainly don’t use something easily identifiable (e,g., the automobile he exited to do the murder with license plates available for all available CCTVs to capture) and trackable in the commission of the crime.
The punk operated out of hate… either personal hate or generic racial hate. IMHO, of course.
Still strange to me, although you do have a point. However, he may have operated openly because he, understandably, felt ‘protected’ by the ‘justice system’ there.
Many women Professionals get away with a lot of hits they are better at blending.