Hit and run is supposed to be a serious crime. I just now read that article. The driver fled the scene and there might have been reasons for that, all of them bad. First, he might have been drunk, and he figured it was better to get caught later and sober for hit and run than it was to stay at the scene and get arrested for vehicular homicide while drunk. Second, he / she might have been driving with a suspended license, another reason for not hanging around to face the consequences. Also, the driver might have been an illegal alien, or someone dodging the law, or someone with so many DWIs and traffic tickets that the judge swore to throw the book at him if he ever showed up in court again for a traffic violation. The driver might even have been transporting contraband goods such as drugs or such. Who knows why someone would flee the scene of a fatal collision? I am only guessing why someone would hit and run like that. All these incidents underscore the importance of being vigilant and aware out there.
To fatally collide with someone on a bike, and to just keep going and leave him there dying on the side of the road is a low piece of work, but what can anyone say. It happens.