Here's a photo of Old Faithful from wikipedia...

You will note that the area around the geyser mound is clear of everything, the walkways and viewing areas are about 50 yards away from the geyser itself. here is an area map...

There were Bison all over the place the entire time, to get anywhere you had to walk around them constantly. One big excitement was the Grizzly bear that was hanging around the Inn early on the second morning; a couple of students ran into it on the path and were quite surprised!

One part of employee orientation includes "encounters with wildlife" and it was this information that helped these kids avoid a messy problem with the bear. Another thing is geyser safety. Last year, 2 kids went off the path, trying to find a shortcut back to the employee housing, and broke through a crusted area falling into one of the geyser pools, they died from the heat in just a few minutes, one kid survived with 3rd degree burns over 95% of his body. So safety around geysers is of paramount importance. So look at the map and photo, the only way to pee into Old Faithful is to approach it past all of the security perimeters risking the fact that the ground could be weakened near the geyser and you could fall in and die. The area is also surrounded by tourist trails and buildings; you're not out in the middle of the woods here, so there are a lot of people around.

So yes, the company did the right thing firing these kids. The first day they were warned not to approach the geysers or they could die like the 2 last summer, if they violated this simple safety rule in the 2nd week of their employment they are too stupid to be trusted.

Ok, I'm GrandPa Rich here, but I don't think they had any choice. We did talk to 2 of the guys who had to pull the bodies out last year and it was not a pretty event.