Such a sad, sad story!
Yosemite is indeed a dangerous place. I remember those people last year who tried to cross a raging creek for a photo op and ended up going over the falls to their deaths - I think there were 3 of them who died, even though there were signs warning NOT to cross the creek.
Unfortunately, when these types of things happen, the area will be closed off (if it isn’t already) and deemed too dangerous.
Sort of like when people won’t pick up after the dogs, the city/county/park service just closes the area to dogs. I hike with my two dogs and notice more and more hiking areas are becoming off-limits to dogs.
While on a different scale, I was at the Smoky Mountains last week and was amazed at the sheer number of people hiking the trails totally, mind-blowingly unprepared. One was a 5 mile round trip, 85 degrees with high humidity and not insignificant climbs. People out with no water bottles, in flip flops and carrying infants.
We had boots, daypack’s, food, rain gear, extra water and a water filter to get more.