Of course, Americans don't always seem to heed the warnings and a few of them have gone swimming never to be seen again.
I've heard of them jumping into zoo habitats with predators too. Not sure why all the stories seem to occur in the US.
It's good that the kids can get a good appreciation of what the native predators are capable of, in a non threatening way. Maybe he will be the next Steve Irwin, who knows :)