Interesting find in the article. I will have to check out the geography again.
I grew up in the 70s, my mum was single and we were broke. Even with our circumstances and her lifestyle, she would have never, ever left us alone. Neither would her friends, who were in even more dire straits than us and not as savvy (my mum was intelligent, but didn't seek a college education, and was a bit naive). One of the articles on this thread also states that friends said it would be out of character for them to leave their children alone. So, I agree. Something compelling had to have drawn them away for them to leave their children like that. I don't think it was hunger. But I have to say, when I was single, we had a diner we'd all go to (a lot) after barhopping that served breakfast 24/7.
Also, I missed the part where they were going to buy the car. Where was that info discovered? Still, buying a car at 2 am doesn't make sense, really, even from a private sale.
I wonder how extensively they interviewed the folks who were at the gathering, if at all. Does anyone know? My guess is whatever drew them out of the house occurred at that event. Their departure sounds spur of the moment (no sitter), hasty (leaves purse) and compelling (they felt they had to go right now). What would make someone do that? Fear, someone waiting outside for them come to mind, but definitely not a food run or buying a car, IMHO.