Although I do believe the OW training provided now days (and this is a generalization, there are some - perhaps many very good instructors, but there are others too) is too watered down, or too short of duration, there are other issues at hand. The thing is, there are numerous categories for how events can happen:
equipment issues
health issues
bad choices
bad luck
There are subsets of these too. I'm not sure, despite all the training, how much of these won't still happen.....

Not sure how you can eliminate some or any of these.
I do believe that the number of incidents as a ratio to the number of dives made is very low, but as visitors to the underwater world, we are less than suited for survival. When things go wrong, there is a higher chance of a bad outcome.
Because of SB having an accidents forum to serve as an awareness and possible "education" forum, we are hearing about these more than would commonly happen from normal media sources, so the appearance of lots going wrong lately isn't necessarily accurate.