I appreciate where you heart is at Dom Tuk, I really do, it breaks my heart too to hear of children suffering and dying due to gross neglect, but I really can't equate someone's 15 year old son (though it wouldn't be my choice) being out that late at night with someone leaving a tiny tot in a car in that kind of heat (which frankly is just plain stupidity). However, presumably, the mother didn't purposely harm her child, she is guilty of extreme and utter stupidity, but murder?
I just think that in the majority of these cases, parents don't need our condemnation as they are most likely condemning themselves already.
We also don't know whether or not the 15 year old was disobeying his curfew, For all we know, the parent's may have said "Be back by 11" and he was being disobedient. We also don't know if he was supposed to be in that part of town either....
I think the parents will hammer themselves for the rest of their days in anguish. They don't need our cruelty to boot.
Anyone who has seen their child die, knows that it leaves a gaping, ripping hole in your heart for all eternity, and never ever does that pain go away. Some day you stop crying, but you never stop hurting. Whether they die of natural causes, or a car crash or a murder, such as this, the parents are suffering beyond our wildest nightmares and they have my utter sympathy.