There isn't ONE thing about this hobby, or the keeping of captive corals/inverts/fish, that isn't destructive to the natural habitat of the above. Not. One. Thing.
Given the extremely precarious state of reefs worldwide, and the pressure on them that mounts DAILY, ANY hobby or industry that removes item one from these environments is something that needs to be stopped immediately.
Just the act of keeping corals at home helps to kill corals in the wild. Compounding the damage by collection is something we can no longer 'afford' to do.
Any pretense that anyone involved in this hobby is doing anything 'conservation oriented' is ludicrous. The opposite is true.
Really?
How about all the science and information that has been discovered about corals and reefs through this hobby. For example, effects of temperature, chemistry, light spectrum, etc. And we're still discovering new things. If we don't understand these animals how could we possibly help them in the wild. That is if they actually need helping.
How about the fact that because of the science and information we have learned through this hobby we are capable of restoring the reefs through aquaculture. There are programs around the world that are currently doing this. Without this hobby this likely would have never been a possibility or at least would have delayed it substantially as without the economic incentive, no one would have developed skimmers, power heads, nutrient reducing equipment/techniques, etc.
How about the fact that if the true cause of reef decline is climate change and ocean acidification (which I don't believe is the cause) or pollution (which I do believe is the cause) and not collection (as already admitted by the NOAA as not as great of a threat) were to wipe out a species, the existence of the species would still remain on this planet because of this hobby.
How about the fact that if you remove a portion of a colony in the wild, that remaining portion will continue to grow and now the collected portion will grow in captivity only to be repeatedly fragged and continue its distribution throughout the world. Let's not forget that reef building corals naturally die as the coral grows reducing the light to the areas below the new growth. We can easily correlate this to a shrub. We want our shrub to be a certain height, so we cut it. And it grows back over and over again. Same thing with corals. Now obviously this has to be done in a sustainable way. If you keep cutting the shrub down lower and lower, eventually it will die. Same goes for corals.
How about the fact that because of this hobby it brings exposure to the importance of our reefs. I'm confident when people leave my home after seeing my tank and having a lengthy discussion about corals and reefs, they leave with a better understanding of how important these animals are. Humans have a flaw, out of sight, out of mind. How many people have read or saw a report about deforestation or an animal that is endangered and just consider it another story in the news and move on about their life. This hobby exposes people to these animals. Humans have another flaw, they don't care about what they don't understand. I can sit with the children in my family and discuss how important marine life is and put a face on it. And when I talk about the effects of pollution in my living room I'm not surprised that they pick up trash on the beach or an island when I take them on my boat.
I think there are a lot of good things our hobby does. As Julian Sprung said at MACNA we have a public image problem. Your post is proof of it. We also, as Lenoard stated, need to come together to be more proactive in sustainability, conservation, etc. And finally, in my opinion, put pressure on governments to stop allowing pollution, ports, shipping lanes and agriculture right smack on the reef. There's a PDF report you can find on the net titled "Boom Goes the Reef". It was produced by Greenpeace an organization I don't always agree with, but this particular report highlights what is going on at the Great Barrier Reef with the current coal boom in Australia. A blind man can see with his cane that this isn't good for the Great Barrier Reef. It's sad the government, et al. wants to point fingers at pollution, agriculture, etc. yet at the exact same time they'll permit these types of activities from happening right smack on the reef. Talk about insane. Or better yet, money and politics.