So they should not take advantage of their lakes? They are recreational places -- heck, they're man-made recreational places. They should just say "okay. the alligators are here, I guess we all should stay away. Not just from the water but the beaches"? It's not like there was a bunch of fresh-cut chicken laying around the beach to draw the alligators in for an interaction. The kid was wading in the water -- that shouldn't be seen as a threatening situation by anyone, including Disney. It just happened that it was.
In situations dealing with these kinds of animals, humans have three choices.
1) They can cede the habitat to the animals and just stay away from it. That's the easiest thing to say and the hardest to do, because those bodies of water have recreational, not just aesthetic value. Disney created those lakes with a purpose, and following this course requires them to not only not use them for their intended purpose, but to also void their beaches. The same thing with homeowners -- they pay a premium for lake access, but this suggests they shouldn't use the lake to its fullest potential. It's easy to say "so what" unless you're the person paying the bills. Then you -- like everyone -- want the most value for your expenses.
2) They can decide to accept and acknowledge the risk. Even though it's a very very very very very very small one, there is a risk. This works until it doesn't, like we saw this week.
3) Or they can to their best to eliminate the problem. The only way to do that is to dedicate themselves not just to reactive policies of removing troublesome animals, but proactive stance to trying to remove them all. This would require some law changes and some public backlash and is probably unfeasible. But you could put a large dent in it, and that might be worth doing.