I can't say I'm opposed to this.
The circumstances that led to me getting a bit squished at 15 months old aren't exactly uncommon, bad parenting, or negligence. I obviously have no recollection of the events, but, to make a long story short, my father was driving and was certain - had, in fact, visually confirmed less than 60 seconds earlier - that I was in the backyard playing with my siblings and other neighborhood kids under my mother's supervision and far away from the driveway.
Well, apparently, I was a sneaky little bugger back then. I got away and managed to get away and end up right behind the car. He hopped in the car, turned it on, and was pulling out to go to the store. I was obviously too short to be seen from the driver's seat, regardless of whether he checked over his shoulder or in the mirror (he states, of course, that he did, and he would've had to to get out of the driveway). He didn't hear a "thunk" as he knocked me over, but quickly realized he'd run over something and hopped out of the car to see his 15 month old son screaming in an awful lot of pain.
A lighting fast ride to the hospital later, it was discovered that my injuries were serious, but not life-threatening. The accident had broken my hip in two places. Thanks to being only 15 months old, I quickly recovered and was back to walking in a few months. I suffer no ill effects whatsoever now, and x-rays from two years after the accident couldn't find any damage.
Granted, all of the above happened back in the 80's, when cars were quite different. However, my injuries could have easily been far, far worse. A few inches would be the difference between having a funny story to tell people and being in a wheelchair the rest of my life - or dead. I imagine most of these injuries and deaths involve small children, who either die before they hit elementary school or often have to live with some rather severe injuries the rest of their lives.
As you can imagine, I'm pretty careful now about backing out of my own driveway, especially now that I've got a family of my own. A camera would at least let me quickly and easily see things that I just can't see from the driver's seat. It'll be a while before I buy a car new enough to have one, of course, but it's good to know these are coming down in price.
I tend to lean toward the libertarian side on a great many things... but I'm OK with this.