My heart goes out to everyone involved...such a tragedy for everyone. I don't blame the parents, the gator or Disney. I feel like it was such a freak accident no one could have anticipated it happening.
I live in Coastal North Carolina, we have alligators here. My son's home has a creek running through the back yard that spills into a larger water bed. Last year, a couple were walking their dog and the dog went close to the edge and he was taken by a gator that lurched from the water. Its a powerful split second lurch. There is no way the parents would have been able to stop it once it started. That they got to the alligator at all is amazing. The gator by my son's home was caught and he was over 500 lbs and approximately 50 years old. In the news conference from Florida, I heard there were over a million alligators in Florida. That attacks don't happen daily shows how much the alligators DON'T 'hunt' humans. Here, we also see the alligators ride the 'surf' in the ocean from time to time. They are used to the brackish water (salt/fresh mix).
I would imagine that we can put as many signs on Disney property as we want. If you are from Nebraska or any state without an alligator population, you have no idea HOW dangerous they can be. They are powerful animals and knowing they are dangerous and knowing what they are capable of are two different things when you have lived near them in normal day to day life. My heart goes out to the parents on so many levels. Very tragic.