Yes, well said Mrs DV and Mrs TP.
It is terrifying to think how one day we might all be unlucky and lose our beloved DC.
I have a one year old who puts everything in his mouth. I seem to spend all day fishing random items out of there. I am constantly filled with low level anxiety - if I am in the bath for example and he is silent in another room I suddenly panic that he has choked on something. I try very hard to ensure that he won't but I am only human and things can be missed, or I might be distracted one day, or his big brother might give him something to chew unnoticed by me...
And I have a three year old. I read this terrible tragic story with my heart in my mouth. I know how difficult it is to keep a child of this age safe but also allow them a little independence and the freedom to explore their environment and their own abilities.
I could completely imagine something like this happening with my DS. It wouldn't matter that I was watching him and only a few steps away. In a matter of seconds he slipped and fell in. The currents did the rest 
It could so easily have happened to any of us.
It is very difficult to keep hold of an excited child's hand for any great length of time imho. I can manage it whilst crossing the road with DS [and I insist on it]. But I could imagine that in this circumstance I might have let him walk free believing it very unlikely that he would fall in. And also being ignorant of the currents and how quickly he would have been swept away...
It is a terrible terrible thing and I am so sorry for Dylan's family.
If there is any small good to come of this tragic event it would be that so many of us now are more aware of the dangers inherent in a trip to the seaside and will be more vigilant perhaps.
I know I will be.