I am stating that I agree they made a poor choice to allow their child in the water, because I have seen no swimming signs listed for a host of reasons as to why it was not safe to swim. Allowing him in the water was already a bad choice, because any number of things besides a dangerous predator could have happened. That is what this family has to live with.
But at the same I am simply stating that a sign that had the no swimming/alligator warning (like the one posted across the street at SOG) would likely be more of an alert to a parent not to allow their child anywhere near the water. I think that is a much clearer warning, when many people would otherwise think that getting your feet wet is not swimming. For the record, I would never enter water or allow my children to enter water where a no swimming sign is posted because I do not know what the particular danger is, but not everyone has my mindset. I do think that even a person from another part of the world though with a different mindset would take the no swimming/alligator sign much more seriously, especially when allowing small children anywhere near it.