That's a scary notion...

I respectively disagree. I think the vast majority of people would at the very least call the police and, in the hypothetical car accident, stop and make sure you're okay. I called the police and spent ten minutes applying pressure to a woman's head wound and assessing the extent of her injuries when she crashed her scooter (completely ruining my shirt, I might add), and I don't even have empathy. There were at least ten other complete strangers there helping, calling the police, worrying... People really do care. I should know; I'm an expert judge of these things.