I think if it was the case a child or normal person, someone would have jumped in regardless of any rule. But some crazy nut trying to kill himself? Of course, they going to follow the rules...
If the person was calling for help and struggling, I bet there would be a much different reaction from the officials and observers. A trained lifegaurd would have a hard time bringing in someone that didn't want to come in, so I don't blame un-trained people for not risking their lives to save a guy that could easily save himself if he wanted.