I don’t want this to be moved to GD but I think you’re way, way off base here. The article was clear about the things that led up to the incidents it describes, and in none of them was there a suggestion that any of the parents were “used to leaving kids in car seats” to run into a store.
My wife and I have two young kids. We’ve always had a strict policy that when we’re out and about together, at least one of us had to have a hand on the stroller at all times; as they got older at least one of us had to have our eyes on them, and as they got older still, our eyes on one of them while the other child was being watched by the other adult. They’re old enough now that we’re slowly starting to lengthen the invisible leash we have on them, but they still have to be within eyesight. We have never intentionally left them sleeping in a car while we ran into a store.
When our second child was still an infant, my wife went to the grocery store as she does every Sunday afternoon. The store was literally a one minute drive from the house, and she only drove because she couldn’t carry all of the groceries back if she had walked. She took the infant, which was unusual because they always stayed home with me, but our older daughter was invited across the street for a playdate and I was in the middle of a renovation project at our house, so my wife took the baby.
In the minute it took to drive from our house to the store, she forgot the baby was back there. Ten minutes inside the store, she turned down an aisle lined with diapers and wipes, and froze as panic overwhelmed her. Seconds later she was running through the store, pushing past the elderly slowly meandering their carts down the aisle, burst out the doors and raced across the parking lot.
Fortunately it was a cool fall day. She couldn’t see into the minivan as she approached it due to the tinted glass, but when she was within range she was hitting the ‘door open’ button on the remote. It was open before she got to it and even though she heard the baby crying, she wasn’t satisfied until she had undone the buckles and was holding her to her chest. She sobbed there in the parking lot for ten minutes before she had regained enough composure to go back into the store.
Never before that day, or since, have we ever dreamed of leaving our children in the car without us, whether in a store parking lot, our own driveway or garage, or any other place. It is unthinkable.