A few guys didn't show up concealing AK-47s in their pants afterwards, did they? lol
Sorry, I couldn't resist. I am relating your experience with the lady in Philly who called in a posse after someone gave her lip on how she shouldn't discipline her child.
In all seriousness, I think parents shouldn't leave their kids in the car alone, unless they know there kids are mature enough, and smart enough, to handle sitting in a car that is running with the AC on.
The way you explained the situation, it sounded like the kids were pretty young. I am all for staying out of other peoples' business, but when potential death may be involved, I might step in.
Also, I'm glad the cops didn't do the whole "You have to disarm when you're talking with the cops" thing.