Freak accidents can happen anywhere. But that doesn't mean that you ought to bubble wrap your child and carry them everywhere.
Yes, I've left my boys in the car numerous times. Because I live in a relatively safe place and they aren't morons (I taught them well). Statistically,even in New York City, a child has a better chance of being hit by lightning than being kidnapped. It's more likely that some nosy, well-meaning, interfering adult will call the cops at my leaving my kids in the car or allowing them to walk to the corner store alone than anything bad happening.
Dangerous stuff is everywhere. We have to take risks as parents to allow our children to grow strong and navigate the world. From the moment they walk (WHY does that table have such sharp edges!?) we feel the need to save them from every potential danger and owie.
But we can't. So we have to be realistic and logical about what's dangerous, and what's not.
Hot stove with big pot of boiling water: Yes. Dangerous. So teach your child to understand the danger...because eventually they'll be boiling water on that hot stove too.
Sitting in the car for two minutes while mom runs inside: No. Not dangerous. Not any more dangerous than playing the the yard or at the park.
ETA: I also allow them to walk the 3/4 mile to school, go to the park by themselves, ride their bikes all over the neighborhood, and play outside after dark.
Children raised to be weak and fearful end up as weak and fearful adults. I want my boys to be strong and capable.