I'm going to defend divingsiren here. If you dive often enough, you are going to run into some people who truly are "accidents waiting to happen". Generally they are people who are either exceeding their experience and skills, or have a poor attitude, or both; sometimes they're people who physically shouldn't be in the water (the diver who repeatedly has to be towed in from the dive site for exhaustion, or the one who is breathless, pale and sweaty from walking the gear to the car). Sometimes you can be of assistance to such folks, and sometimes they have to learn everything the hard way. We had a near-fatality last year (I think it was) where someone got in a mess that everyone had been expecting to happen for some time . . . he was lucky, and survived it.
We have a thing about not speaking ill of the dead; but if there were behaviors or judgment errors that this diver engaged in habitually that may have led to her death, someone else may learn something from knowing about them.