It lands for me like the general public think that there should be an emergency stop button that's able to grind every carriage on a ride to a holt at any point in time during the ride. I dunno, I guess I have pretty opinionated views on this, I think it's a safe bet Dreamworld would have CCTV of the incident and emergency procedures in place (including reponse times to incidents) just so they can satisfy the State's safety requirements to open the ride in the first place. Knowing so little of what really transpired I guess it's all up for speculation, I honestly feel like TLDR, this guy got butthurt (figuratively and literally) when he did something genuinely ill-thought out to impress his mates and now he has someone in his pocket telling him there's money to be had from this kind of situation, because that's the day and age we live in.