Because he wasn’t a him. He was a moving object. Do you think the Sioux and Cheyenne were only scalping whites at Little Big Horn? In war, lots of people get killed, and usually the party doing the killing doesn’t take time to differentiate and have a “why” for each shot fire.
Probably, the conscript-who-shot-him’s thoughts were “CAR!” and “SHOOT!” and then “OK. NEXT.” A fellow journo probably saw the whole thing.
“Because he wasn’t a him. He was a moving object.”
Tell that to the media - they’re basically saying he was targeted by Russia because he’s a journalist (and then his body was handed over Ukraine, so that Russia could get blasted in the media, I guess?).