I started out as a vacation diver. I took OW with my Dad. I recognized from the get-go that my Dad looked like a Dufus underwater, where the instuctor looked smooth and effortless. There was noone else to influence my observation, and I had never been exposed to scuba before, just me, my Dad, the instructor. My Dad is still a vacation diver, and I am a cold water instructor. I do my very best (regardless of agency & training standard differences) to make all my students aware of buoyancy, trim, finning & skulling. It's simply a matter of pointing these things out to students and instantly (most) want to improve.
These threads all end up the same. Do you think that noone should be able to hike in the forest unless they've what? Taken all the courses at Outward Bound? What about learning the basics and then working on self improvement? The problem is like any other sport (where many of us strive to be the best we can) many people just dabble in it occasionally without being concerned about improving. Do any of you hike? It boggles my mind that someone is 4 hours from any rescue and they have NOTHING for self rescue. What the heck are you doing here and why are you stepping on all that delicate endangered columbian carpet moss? What do you mean you have nothing for self rescue or survival....
What about including Proper Diving Etiquette in training?
The DM should include awareness in the briefing... "many of you haven't been diving since you were here last year, welcome back, and to our new divers welcome to my ocean. I am reminding you to be aware of the environment you about to enter and to respect it by practicing proper buoyancy, be aware of where your fin tips are by finning in such a manner to not make contact with our reefs, please watch me as I do my best to set a good diver example"
Maybe a decent briefing will spark at least one vacation diver's memory as to the training they had...and if they didn't get the training you are directly pointing out what you expect, and you are setting an example.
Accept it, Scuba is not that elite. Lots of Vacation Divers. Let do our best as regular divers to teach the vacation divers to respect the sport and the environment. Instead of focusing on lack of training/agencies.