IMO I think Disney has some responsibility in this. They can't expect everyone visiting their resorts to understand the Florida wildlife. When you're visiting Mickey Mouse the last thing on your mind is gators. You're so excited at being in Disney that you're not watching the water. I know the signs say no swimming. But standing in ankle deep water technically isn't swimming. The signs need to be clear to say away from the water. But even better, Disney resorts need to stop making beach areas for tourists to walk and lay on. It's entirely misleading.
You can bet that the magical kingdom is full of magical lawyers right now, Disney's lawyers. This is going to be one hell of a law suit. I think it is also safe to say that there are plaintiff trial attorneys doing everything they can to get a hold of that family right now, too
I lived on a lake in central Florida for several years. We had an alligator that ate the ducks and got a hold of a few cats and dogs. So of course we did no swimming nor wading. One resident became concerned and called the game warden. He came out and said if there had been no attacks on humans yet and we had no consistent sightings of the alligator, that he was going to just let it go as is. He said that if he removed our alligator it would only be a matter of time before another one would come in and claim the space. And that the new one could be very aggressive towards humans compared to our current beast.
But this man-made lake is built for the tourists at Disney, you would think they would not allow alligators to inhabit it!