I sense a disconnect here... the unskilled laborer "ride operator" I agree bears minimal responsibility. He does not have the la ude to make decisions about who can and cannot ride the ride, other than the concrete rules about height.
However, the "ride operator" as in the business that operates the ride has responsibility to provide a reasonable level of safety for its customers. According to their own rules, it was OK for a six-year-old to ride unattended on a ride that had no safeguards to prevent falling over the side 90 feet to a horrible death.
It is not onerous to have belts that a six-year-old cannot easily unlatch. It is not onerous have bars along the side of the gondola to prevent falling out. These would be reasonable safety measures, and both the manufacturer and the ride operator (as in the business) were negligible not to have them.
It's not unreasonable to say that even if the mother had been on the ride, the child quickly could have unlatched his belt, and bolted off the side of the gondola before she could react.

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, you can never have enough hands to keep a child in place for a long time.......
