I think the type of woman or man who would leave their child inside a car alone even for a "minute" would be the same type of person who would not thank you for your concern. They are so ignorant and so blind to the dangers of leaving a child alone - what can you expect from such a stupid person but a negative reaction? I do commend you for your concern.

I think you should have made a note of their license plate and called the police. Even if the person had returned to their car and had left before police got there, it is still best to let the police know about it. Try to describe the car and the driver (if you see the driver)and the child to the police. Even on a day that is not hot, a car with windows up or barely cracked can get hot inside very, very fast.
And of course the child could be kidnapped or car stolen.

I have read so many accounts of this happening here in California but it happens everywhere. I even remember reading about a woman who had arrived home, took all her groceries in the house - but forgot her child who was in a car seat and about 2 years old parked in the driveway. No one driving down the street would have seen the child as the car was up the driveway and not on the street.

Unfortunately, she went to sit down on the couch and fell asleep - leaving her child in the car for several hours. The child died due to the heat inside the car with windows all up even though it wasn't a hot day but warm. The newspaper article said the temperature inside the car was extremly hot from what I remember reading about it. I'm not what they did to the woman after this tragedy happened. I just don't understand how she could forget her child or why she didn't take the child inside the house first and then go back to get the groceries.