Earlier quoted context omitted.
If the father became unconscious, had a stroke or a heart attack, etc. while driving or doing anything with the child away from other people, the child could die.
Yes, but people would know the child was there. If someone fall down unconscious in the middle of the supermarket nobody knows which car they arrived in, or even for sure that they arrived in a car, and nobody knows about the unattended child. That's a different kind of risk. On the other hand, for the person in the parking lot to film the child in the car and call police, but not make any contact with the child or w…
If the mother (to stay with the original article) would've fallen unconscious or dead in the supermarket, nevermind that both options would have some consequences for the family, the kid would've been fine.
Calling the cops was fine. Creepy the way it was described, but okay.
Cops arriving was fine. That's their job.
"Huh? The "abandoned" kid is gone already? Let's trace the car and take out our frustration on .. the mother?" wasn't fine. That was just braindead. The correct movie quote variation would've been "Nothing happened, move along".
Theoretical "But here's how the kid could've died" arguments are .. weird. And countless.