When people spend 14 years bleating on about the parents’ “neglect”, is that occupying the moral high ground in your opinion?
That is indeed one of the things that some people find inexplicable. The claim by Kate McCann that it felt safe was her explanation for not expecting an abduction, but she never addressed or explained why she ignored the reasons why most people don't leave small children home alone in an unlocked apartment.
Most people stay home or use a babysitter because of those other reasons;
Cholic. Vomiting. Sore nappies. Coughing. Choking. Bad dreams. Overheating. All kinds of thing can distress children. I can't understand why some people have resolutely ignored the fact that the McCanns were perfectly happy to submit their children to those risks and to accept that they might be upset for up to thirty minutes without anyone there to comfort them.
In my opinion occupying the moral high ground includes showing concern at the way those children were abandoned to cope alone with anything which might have upset them.