As long as you’re sober, chances are you’ll never be charged with any crime, much less manslaughter.

I'd really like to see statistics with this, I have a friend who was charged with multiple felony accounts of attempted murder/manslaughter (I thought the definition of manslaughter was that it wasn't preplanned, so I don't know if you can get charged with attempted manslaughter?) because he hit a house with his car while it was occupied. So this rings false to me. I also can't imagine anyone, especially a responsible DA's office, refusing to prosecute a child's death if it was the result of a car accident. Perhaps this is the case when the insurance companies agree that the dead party is "at fault" in the accident but still. I'd like to see data.

In New York City during the last five years, less than one percent of drivers who killed or injured pedestrians and cyclists were ticketed for careless driving.

I suppose this is my evidence? But just because they were not ticketed for careless driving does not mean they were not prosecuted in court for murder.

Edit the second: Well now here is an interesting article about New York, New York City, fatal crashes and vehicular h omicide. As it turns out New York has one of the most narrow definitions of vehicular homidcide in the USA - so it's not a good representative sample of the country as a whole. However, it's an interesting read.