gianaameri - you raise some interesting points to my mind, but also open up a Catch 22.
First, I don't cave dive, I never had, and realistically probably never will. Although I have to admit I would love to come to Florida, do a cavern and cave course and have a look at some, but in reality that is unlikely to happen. Work, geographic location, finances, family, age

and so on isn't really on my side anymore
The only overheads I enter are occasional wrecks, and I have been formally trained to know my limits and do that safely.
Now for the Catch 22 - I mentioned earlier, and you have repeated above "you don't know, what you don't know".
I read very widely about diving, I have read books and have a wide range from on gas blending, decompression science, diving physiological/medical adaptations in mammals, surface supplied diving to other obscure text books and I have looked for information on cave diving from time to time, and I have imported books from the NSS on the subject.
However other than basic 'course outlines' I have not been able to find very much
detail information on the required knowledge and skill sets and competence levels needed to dive caves safely. If these were more widely available then there would be the opportunity for some of these people who do not take courses to at least have an idea of what they don't know. It may encourage some to go down the route of taking a formal course to get the skills, and encourage others who do not take a course to at least make sure they have understood the skill sets and techniques they need. OK I know and accept others will just look at it and it will re-enforce their self opinion that they don't need a course, but they wouldn't have taken a course anyway!
If this leads to some people taking courses that wouldn't have done so otherwise, and some others gaining the skills by other means then it will contribute to safety in caves.
It will never change the mind of the Spivey's of this world, but it might help some, and prevent some accidents.
I don't want to take away from the livelihoods of people who teach cave diving, or discourage people from getting proper training, but if the information was more widely available it might help fill a gap in letting people know what they need to know.
Phil.