So, if I understand your laws correctly, leaving one's dog to die in a sweltering vehicle is a criminal offence but as far as you're concerned leaving one's child to do the same should not be.
No.
The dog references are total red herrings. It's equally illegal to leave a child in the car on purpose. We're talking about a very specific set of cases, that seem to have a very specific set pattern, and that studies show a unique pattern of habituation that removes intent and for which said habituation is possible for anybody.
My understanding of your reasoning is that an accident of that magnitude and loss is punishment in and of itself.
My reasoning is that is an accident purely due to lack of intent and neurology. Not simply because it's an accident. But purely because its an accident that occurs with a parent that acted in a manner that other parents do as well, and physiologic conditioning resulted in the accident. Not neglect and not intent.
Beyond that, an objective look at the punishment shows that it does not meet any of our usual goals in society. So I question why the focus on criminality. What do we gain as a society?
People get in drunken car wrecks kill their loved ones and there is a great magnitude of loss I'm sure. We still use the criminal system for those people appropriately. I'm not simply arguing that if there's a big loss there can be no criminal finding.
I don't know how you would expect that not to be abused in your society.
Indeed that is a concern. But that is a detective question and not one of criminal proceedings if you are clear on the details. When this phenomenon got press coverage decades ago, I remember seeing follow up stories in which fathers would intentionally leave their child in the car and then try to act like they blanked out. Interviews about the behavior before and after, as well as their inability to keep their story straight busted them.
But I'm not trying to hash out being a great Detective. If you 100% know that the mother or father love their child, was good to their child, intended to bring their child to daycare like the OP, etc. Do you still jail that parent? That is the thread question. All the details of the case have been posted, and any references to cases with change details on intent or reasoning for leaving the child in the car do not apply.