Please stop blaming the parents. Besides bring inappropriate at this moment you have no more idea of what actually happened nor how diligent they were.
As to watching kids constantly, from my background as a psychologist I can tell you from studies on attention it is virtually impossible for even the most diligent person to maintain perfect attention, especially over extended periods of time or in crowded situations. People will swear up and down the never lapsed even for a second whereas objectively they were losing attention constantly. So, everyone, repeat everyone has lapses in attention. It doesn't make then bad or careless people, just human.
And as someone who has been in the hospitality business as well for many years, 'escaped kids' is something you deal with all the time. Kids are escape artists and they get away from you in a second (see the paragraph above human attentiveness). And tragedy can happen in seconds as well. In this case only a few seconds are required and drowning is very quiet.
For me, I am focussing on the horrible emptiness, sadness, guilt, grief and various emotions the family is having now and will experience for the rest of their lives. I also feel tremendously for the life guards. They were reported to be crying and distraught. I can speak to this from my youth, any incident is terrible because it represents a failure in your job, even if there was nothing you could do. Even witnesses are said to inconsolate and weeping.
There's lots of tragedy and hurt and human pain in this and not much blame. Let's focus on the tragedy this is and please stop with the persistent and totally misplaced attempt to assign blame.
