I agree that sidewalks are for pedestrians, but do ride on them from time to time depending on the situation. When I do so, it's at low speed so I can react or stop on a dime when necessary.
What doesn't amaze me anymore (sadly) is that this jerk simply left the scene without any sense of responsibility. Hit and run are the province of lowlifes anywhere and any time, regardless of whether they're on two wheels or four, or even on a skateboard.
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WARNING, I'm from New York. Thin skinned people should maintain safe distance.