Take a quick look at the Google results for "Street Racing Manslaughter". It's littered with cases where the guy in the other car that didn't kill anyone gets the same charges as the one that did, including manslaughter. It's like being the guy in the getaway car when someone gets capped during a bank robbery. You may not have pulled the trigger, but you're getting charged in the shooting anyways. Scary stuff.
It was a lot different in the pre-Fast and Furious age. The first Woodward Dream Cruise had people standing in the middle of the street flagging races on a main thoroughfare, and that was barely over 10 years ago.
We used to always drive like madmen between Detroit and Toronto. The Canadian guy that got me into fast cars sold his 99 or 00 C5 that had a 436 ci stroker in it to some guy in Toronto. The new owner subsequently crashed it in a three way street race on the 427 about 5 years ago, smashing it so bad it threw the engine over the barrier into oncoming traffic. The driver died like a week later. Now? If they catch you street racing, going 30 over, or anything remotely related to street racing, they are taking your car on the spot.