Baby left in a car at the supermarket

[Pinkerbells]

Shopping in my local supermarket. I parked my car as normal, but noticed that the car next to me had the windows down. I'm not talking a little bit to let air in, I'm talking about every window being all the way down. My teenage DD said 'oops someone forgot to shut their window's'. I looked across and straight away clocked the baby seat. I said 'there's A baby on it's own'! We had a bit of a debate about it and we sat trying to work out what to do. We were probably sat there for 5 minutes, so plenty of time for the parent to have dropped off a trolley, or even go to the cash point at a push. The child was quiet still so I'm guessing it was asleep but it only looked about a year old.
In the end I took the licence plate and reported the car to customer services who immediately alerted security.
But WIBU to report this? I understand in a petrol station it is a different matter, but in a supermarket?

Tabatha how do you reconcile the fact 11 year olds very commonly travel to school alone by public transport and on foot and that this is absolutely common knowledge for schools, social services and police, with your belief that leaving an 11 year old sitting in a car for 15 minutes is a safeguarding issue? There must be a hefty dose of cognitive dissonance involved in holding your belief while knowing what is average or normal for age 11...

Unbelievable that this even happens in our day & age. You 1000% did the right thing.

For people saying kidnapping could happen that's probably a lower risk compared to what I was thinking, like I don't know a car crashing into the car with the baby in. A thief stealing the car with the baby in. Of course overheating, all the windows open? Sunburn on the babies face. Like there are SO many reason why you should never leave children unsupervised in a car for unknown amounts of time. Just wait till they wake up or take them with you. It's not difficult.