Leaving three young children on their own should never, ever be termed a mistake. It was, remains and always will be a deliberate act and as such should, in my opinion, be tested against what constitutes criminal negligence, gross or otherwise.
And I don't accept the hindsight defence. Brenda and I didn't need hindsight to tell us that we shouldn't let our kids play near a 300m sheer drop or let them play with fire in exactly the same way that we didn't need hindsight to tell us that it would have been totally irresponsible to leave them alone in an apartment.
I also hope that the little girl is found. But I cannot comprehend what she may have been through in the last four years:(.