When I was a student at the University of Florida, there were gators who wandered into the various pools on campus. I remember there was a gator in one of the dorm pools. I grew up in Chicago and lived there until I was college aged. Even with no experience with gators in the past I had enough common sense not to get into a pool with a gator, even though there was not a no swimming sign next to the dorm pool. The dorm was on the end of campus away from Lake Alice, near one of the busiest intersections in Gainesville. So, obviously, the gator must have walked quite a distance to get to the dorm pool.
I was reading that the Florida fish and wildlife agency is trapping the alligators, and so far three have been euthanized, and so far, they haven't found the child. I presume the animals are being euthanized to be checked for human remains, since, if they weren't looking for the child, the animals could be relocated to a safer area. This situation is tragic on so many levels, and as was the case with the child who went into the gorilla enclosure at the Cincinnati zoo, the animals are the ones who are paying the price.
I do a lot of nature related activities. One of my favorite places to visit is Ding Darling on Sanibel and another is Corkscrew Swamp. I have had semi-dangerous close encounters and near misses. Once while hiking a trail in one of the Audubon areas, a cottonmouth crossed our path. I have a great picture of a cottonmouth in attack posture showing the inside of his mouth. Fortunately, it was taken from 10 ft away. When we are doing nature observations, we need to remember that we are invading the animals' habitat.
I believe there is a sign at the edge of the artificial beach at GF not to go into the water. According to news reports, the father and child were wading in the water. I remember that on one guided tour I went on several years ago, a movie was being made in the water in the reserve we were visiting. Before filming the movie, the alligators supposedly been removed. While filming the scene in the water, sure enough, the actor involved encountered an alligator. It would be very difficult for Disney to ensure that there were no alligators or any other wildlife on the grounds, if not impossible.