Although a lot of under 18 are sensible and most likely wouldn't misbehave there's always a few that will.
And under 18s still aren't legally responsible for themselves.
This is more to cover themselves more than anything I would guess.
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You could easily flip that around:
Although a lot of Adults, over 18 are sensible and most likely wont misbehave there's always a few that will.....
As for what happened on the ride at Drayton, and supervision in general.
If you are taking a youth group, such as Scouts to a theme park, then you should have an idea on what individuals will behave if left to enjoy the park in groups not supervised by an adult which ones wont and may need some adult supervision, and which definitely wont behave and as a result wont be coming
Another aspect is in how the park deals with people that break the rules, and how well the rules are communicated to customers, a pre recorded message in the station is not good enough - this would have to be dome by who ever is loading/dispatching the boats verbally and further re-enforced by signs on the ride, such as a vinyl wrap on the rapids hand rail.
As for those that stand up, what does/did the park staff do when dealing with these people? if the answer is nothing then breaking the rules just becomes acceptable behavior -
if they are doing it then so can we
An over 18's rule on the rapids, and other rides will in the long term be detrimental to youth groups, schools etc booking as they will look elsewhere as its impossible to have adults escort groups round the parks all the time
School trips/youth group trips to places such as Alton towers should be seen as a privilege and not an entitlement, however it seems we are living in a world where everyone is entitled to everything, and people are awarded for participation over achievement.
As for the ride - spot the adult in charge of the School group on the official site:
https://www.altontowers.com/theme-park/congo-river-rapids/#ride-information
My only comment on the picture of the group on the raft is that they are wearing Ties round their necks, which could pose a safety hazard