I agree that that's a lame arguement. But some people do go a little overboard butting into others business.
I'm the father of a 23 month old boy and a couple of months ago I needed to run inside a BP Mart (gas station) to get change for a buck. My car was less than 7 feet away, back seat window cracked..I was out of the car for about 45 seconds, tops and my eyes were peeled on my son the whole time.
All the time I was afraid of some doogooder staring daggers at me.
Maybe so -- but I suspect that this little kid is still alive because the Wal-Mart lady butted in this time.
I used to run into a local 7-eleven to get a slurpy for my older son and I, and I would leave my baby twins in their carseat, especially if they were asleep. I didn't have to worry about the heat, and I always parked where I could see them. We also live in a very safe neighborhood.
My kids are 8 & 10 now, and nothing happened to them.