To be fair, most of us would probably bemoan the fact that kids today aren't given the same degree of freedom/access to danger that they had even 20 years ago. The father of the little girl obviously didn't want to do the socially-normal thing of wrapping his daughter in cotton-wool and unfortunately paid a really heavy price for that. It's unfortunate that her mother is obviously of the hand-wringing, "won't somebody please think of the children" brigade. Maybe she didn't used to be like that, maybe losing your daughter in those circumstances makes you see things differently. She should however have been very gently and tactfully told to get lost, that you can't mitigate against every single disaster that can potentially befall your child.
People have always gotten themselves killed/injured/otherwise in trouble, well before Youtube existed to give them pointers. The kids who died underground at Alderley Edge (1950's?) spring to mind (Were those deaths the direct impetus for the blocking of the mines there?).