A lot going on here...
Good they are charging two of the kids. All three should be charged as juveniles and punished appropriately, calling for the deaths of these children is overboard.
I'm for holding the parents to some accountability, but unsure to what degree. Definitely not imprisonment, though.
Whoever the adults watching the little girl while her mom was away should feel awful. Why is your 5-year old in a position where she can go along with other kids, anywhere? I have three daughters ages 8, 7, and 4. I have strict rules to outside play, and only started letting them play outside, a year or so ago. Been drilling specific messages into them for a long time, but this also goes for the 8, 9, 10 year olds parents. My oldest daughter is 8. She is not allowed to just hang with the neighborhood kids or go wherever the fukk she wants, and the kids in my complex in this 4-10 range, there are definitely a ton of em who be out and about unsupervised all the time.
(Just earlier Saturday night there were a grip of em sitting outside my place on one of those electrical boxes, on the phone, using all kinds of "mf" and "b.a.n" curses)...not my kids so I kept it pushing but these are young, prepubescent kids. My daughters do not roll with them when they are with me.
So I see all the time that there are too many parents who let these young kids out unsupervised. This is a sad, troubling case all around.