I personally witnessed a teenaged girl (17-19) at the Yellowstone Geyser Basin area leave the boardwalk, walked across the crust to take a closeup photo of one of the geyser pools with her i-phone. Her parents were with her. I told her parents how dangerous and illegal it was and they just shrugged, claiming she would be ok. Head shaking moment. You can't fix stupid.
Italians don’t necessarily do this stuff. I walked up the Tower of Pisa on a very rainy day. It’s made of marble and was dangerously wet and yet kiddies were running past me. No signs, no barriers, no nothing.