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Lizzy, I think your opinion is yours and no-one should chastise you for it, but this is the fault of the parents, pure and simple.
No matter how safe a place is proved to be, you should never leave underaged children alone. End of.
Accidents happen in seconds, let alone in 30 mins. You wouldnt dream of leaving you kids alone in the UK let alone in a foreign country. Volvos are deemed the safest cars in the worls, but you can still be klilled in one in a crash. Unfortunately, the way society is these days, no one is safe anywhere. Murders happen in the most quiet and rural of places, not just in cities. SO you see, even thought it must be hard for the parents, you can not feel TOTAL sympathy for them, as they have placed themselves, and their poor daughter, in this horrible and totally avoidable situation