at Yosemite National Park about 10 years ago. On the mist trail, climbing up stairs on the rock face, cables to hold on to, you arrive at the top of Vernal Falls. It is beautiful, look over the edge, breath taking views. There are signs all over the place that say something to the effect, if you go into the river, even if the water is shallow, you will be swept over the edge, because the granite rock is very slippery and you will die. Do not go in the water. The signs were in multiple languages, with pictures that tell/show you not to go in the water, show what will happen it you do.
Well, a few weeks after we hiked up to the falls, a church group from Modesto, on a day trip, didn't take the signs seriously or bother to read them. People were screaming at them to get out of the water (I'm sure they had ptsd for a while from this). The people in the water just laughed and waved at the terrified people one the river edge not understanding the danger they were in. They didn't understand or believe the signs, and they went over the falls. I think 3 people went over the falls. It took days to find all of the bodies.
I've been to Yellowstone more than once, there are signs there too. Sometimes people just thinks the rules are for other people, not themselves. Going to National Parks is going into wilderness areas not Disneyland type parks.
I'm glad they were able to identify his remains for his family.