... I have a major problem with the word "safe" as in "diving is a safe activity." Safe means, "without risk." ...
With all due respect, and I do respect your knowledge and experience highly, "safe" does not mean "without risk." "Safe" is a relative term and has meaning only as it relates to some implicit or explicit comparison. I am highly skeptical of your claim that car racing is safer than diving, though with the proviso that there are many different kinds of diving. Reading
Alert Diver, I come away with the distinct belief that tech diving poses far greater risks than recreational diving.
Nothing meets your definition of "safe" since nothing is absolutely without risk. A plane could crash into my house while I stay home because I don't feel I could pass the kind of diving course that was once described to me as the NAUI course of yore.
I wholeheartedly agree that more training, by a competent instructor, is always better, and will reduce risk. I am probably far less competent than most of the members of ScubaBoard. But knowing this, and given my interests, I limit myself to moderate depths, in warm, clear, relatively calm water.
I have never observed another training class than my own. Based on what I've read here, some instructors are overly lax. My instructor only taught me the PADI curriculum as far as I know, but he was patient, and took all the time I needed to learn and demonstrate the skills, and when I had trouble with any, he had me do them over until I got them.
I believe that the most dangerous part of any of my diving trips is driving to and from the airport. Compared to that risk, I believe my training, combined with the quality of my equipment (middle-range modern gear) makes the kind of diving I do quite safe.
I respect the underwater environment and its risks, and I dive within my limits. But if (as I suspect) I'm 100 times more likely to die driving to the airport than in the water, I'm comfortable continuing to dive at my level of training. Though if it were practical, I'd love to take a course with you to further improve my skills. More skill is always a good thing. (Though I'd still limit my diving to moderate depths in clear, warm, calm water, because that's what I enjoy.)