Child thrown to crocodile, who's to blame?

One of the big stories in the UK yesterday is of a mental patient on a day trip to a zoo who picked up a random 3 year old and threw him to the crocodiles. It didn't end well.

But who is to blame? The mental patient, his handler, or the child's parents for not watching their kid?
Child thrown to crocodile, whos to blame?
The mental patient
His handler
The parents
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Child thrown to crocodile, who's to blame?
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