I wasn't there, and don't know what happened, but, I can remember when I was about 12 years old watching kids jumping off of the roof of a nearby building into the motel pool. I remember that there were adults there (my parents wouldn't let us into the pool while they were there) and no lifeguard. It could well have been that the kids jumping were young adults--I just remember that they were older than me, and younger than my parents. And, over the years, I have cared for more than one patient who was in the teenage/young adult age range when they suffered some type of debilitating injury, that might have been avoided by better judgement on the part of the patient, or better supervision by a parent, or whatever. I had a classmate who died in a fall from the observation deck at O'Hare airport.
I really feel sorry for the family of this young boy. It is about the saddest situation that I can imagine to lose a child, for any reason, in any place.
But, I will take the unpopular stance that it is a bit unjust to sue a business, or individual, for an injury or illness that just happened to occur on their property. For example, I live on a wooded lot that is surrounded on 3 sides by a 10-15 ft ravine with a creek at the bottom, with a stop sign that is directly across from my driveway. There is a retention pond across the street. Nearly every winter, somebody manages to miss the turn, and drives there car into the ravine. Sometimes they hit my trees, or mailbox, or make deep ridges in my lawn. Somebody even drove their car into the retention pond, once. The street and pond don't belong to me. If you stop at the stop sign, and don't drive too fast, you should be able to miss the ravine and pond. I have lived here for almost 20 years, and have managed not to drive my car into the ravine, or hit the trees along my driveway, or drive into the pond. If you don't want me to sue you for hitting my tree, or my mailbox, or ruining my lawn, then don't sue me because you were driving too fast and drove into the ravine.
Likewise, if you are at an airport, on top of the parking garage, watching the planes take off, and you decide to climb onto the concrete barrier and fall, I think it's a bit unjust to sue O'Hare. Likewise, running on a wet pool deck, or whatever. Some things are just common sense. Which sometimes goes out the window when money is involved.