They've pulled out and killed at at least five, which I also find ridiculous. They say they're looking for "evidence" of the offender. Like one alligator is the danger and others would not be. Humans engage in some of the dumbest $#@! meant to make everyone feel better.
My previous posts regarding other hazards (without warning signs up) relate to this. You're overreacting. Insanely. It's tragic this child is dead, and it's no one's fault. You're screeching that Disney (because it has money) should have posted "Warning: Alligators" signs around the lake that's used for fireworks and boat shows. This family is from Nebraska, and many have pointed out they have no idea about alligators. Why is it your assertion that kind of sign would have stopped them from wading in the water? If they know enough about alligators to realize there's a danger, then they don't need the sign.
They have found five alligators in a really huge area, during mating/nesting season. That's actually surprisingly few, which speaks to their wildlife spotters doing a pretty good job overall. They're looking for evidence that one of the ones killed is the offender because if none of them is, then there is 100% for certain another alligator out there, and they need to keep looking. I'm not sure what's hard to understand about that.
There are a million and one acts of God and forces of nature that can kill you at any given place. There's no room for signage about all of them, many of which are still way more dangerous than alligators.
Mind you, most people agree with you, which is why there are signs and warnings on things that simply don't make sense. There can't just be a rip current sign; there has to be an entire essay on what riptides are and how to survive them. You even have warnings based on urban legends and misunderstandings "just in case." Disney will very likely get sued, and they'll put up an eight-foot barrier in that area, and also anywhere along the shore (even where other shows take place). Then they will have to put "do not climb this barrier" signs everywhere, in multiple languages.
The heart of the matter for you is how much money they have. The person whose home Suz was staying at did not have a sign, yet there were dangerous gators in the area. You don't seem as angry about that.
Gators used to get in the pools in our neighborhood all the time. Should every homeowner have been required to post a caution sign to avoid liability?
I lived in FLorida, and we swam in freshwater. This is nobody's fault - it was a tragedy.
This is why I mentioned storms and snow. I might also easily have mentioned lightning, which kills/injures A LOT of people in Florida each year, and is way more prone to strike during certain activities. They are natural occurrences that the people who live around them get used to, just like gators are here. Someone coming to your area is not used to those occurrences, and could get injured/killed. It doesn't mean it's their fault for not knowing, but it's certainly not your fault for not thinking to educate them on something that is super common in the area.