Jean,
Please preface this with a BIG IMO.
When we started our first saltwater aquarium (30 + years ago), one could make the same argument for seahorses, cuttlefish and octopuses in addition to all the commonly kept corals. Some will still make that argument and say no one should be allowed to keep an aquarium.
The student who studies and learns should not be ruled by the inept and uncaring. Personally, if I find that I can't keep something, I won't go looking. If I go looking, it will be for the kind of vendor that has a clue. Yes, I have met the guy you were talking to (perhaps his twin given the distance) but I spend time explaining (more than some want) the specific needs and habitats of my critters to anyone (this includes the electrician, internet provider, HVAC guy, mailman, FedEx women, neighbor as well as the grandchildren - true list) who visits the house. The most easily available reading books for the grandkids (either for them to read to us or visa versa) are all stories or how to care books about our specific critters. I can guarantee my eight year old granddaughter can tell you more about saltwater critters than the guy you were talking to and probably more than most of her teachers in school.
My point in this ramble is, saying that there are idots in the world just doesn't win my allegiance to not do something. I CAN be dissuaded because of lack of resources (financial or knowledge) or a large laundry list of other reasons.
If we're still talking, I'll join you in your choice of beverage - it must be 5:00 somewhere.