Indeed, no one deserves to lose a child. The difference with your story however, is that you were trying to keep an eye on her, and lost sight of her. Had you let her go off to play while you went for a sambuca and then had to pick her up from lost property, you'd also be getting blamed for your...
A fair number of people I know have left young children (under 5) at home along while they do the school run (30 mins). I'm not sure they'd be any better on holiday.