I've replaced 4 car windows so far. I now feel obliged to keep signs on all my windows explaining that my hybrid is on, that the AC is on, that it is cooler inside the car than outside, that hybrids can be very quiet when they are turned on.
Nobody gives a fuck about your rationale, the fact is by leaving children/animals alone in the vehicle you are being negligent, and at the very least deserve your window busted out.
FYI, death by overheating is not the only bad thing that can happen to a child/animal that's left alone in a car. When I was about 6 my dad left my brother (then 9) and myself alone in his truck... long story short, my brother knocked the truck out of gear and we went crashing through the neighbor's living room. Had their little girl been playing 3 feet to her left she would have been crushed.
Another anecdote, a friend of mine from work told me about how, once in the 1990's, his wife left their 3 daughters in a running vehicle while she ran in to a store. Some pervert stole the van and raped the daughters (all 3) before dumping the whole she-bang on the side of a back highway.
The moral here is, don't be a negligent fuck, and if you insist on being a negligent fuck, don't be surprised when someone who isn't breaks out your window and calls the police on you.