Definitely a sad story, but I have to say, I am disgusted at the vehicular homicide charge they're throwing at the driver. Don't get me wrong, he was definitely in the wrong here, but throwing a kid like that in jail for driving like an idiot?
Maybe I am way off base here, but I just don't see how that is beneficial in this situation.
And most definitely, wear your frickin seat belt. It is far more likely to save you than anything else.
Lastly, I was at a lake resort in Minnesota with family some time back. Similar situation as this, though it involved a boat. Apparently, a guy who lived on the lake would frequent the resort's shop for various supplies. On this day, he headed over and apparently hit a wave that knocked him out of his boat. In boats, you have a strap that is tied to a cutoff that kills the engine if the driver gets pulled too far from the location. He wasn't wearing it, and as a result, he was kicking in the water and the boat was throttling around in circles and eventually ran him over as no one could devise a way to stop it in time. Dead.
Safety devices are there to protect you. If you don't wear them, at any point, you run the risk of being dead for not doing something very, very simple. Sad, but it is what it is I guess.