There was thread on SB some time ago that discussed the re-make of the short film, "A Deceptively Easy Way to Die", which focused on the dangers of unequipped, untrained divers entering the overhead environment. A couple of posters postulated that the film should be shown to all open water divers as part of their training, noting that "overhead" extended to wrecks and coral "swim-throughs": in other words, environments that pretty much all divers would encounter at one point or another. Not everyone took kindly to the idea, with one poster (an OW instructor, if I recall correctly) in particular arguing that showing the film would frighten divers away from the sport. The upshot is, is that while some OW instructors would be all for the idea of a more in-depth discussion of the hazards of overhead environments, there are others who seem strenuously opposed to the idea.
Diver drowns in guided cenote dive
That's the thread.
I suppose the posters speculating that the video is too scary for people looking to get into the sport can tell the bereaved families of these experts that their loved ones were acceptable losses.