I appreciate the civil discussion. I think one thing is pretty certain, no one's mind will be changed despite anything said on this thread.
I for one do not feel guilty nor feel keeping my reef tank is destroying any reef, and in no way at all feel guilt nor feel unethical at all. It was stated that someone agreed with me on coral collection as being a renewable resource, but it is not properly managed at this time--maybe so maybe not, I have no data to make that judgement. You woulkd have to have detailed data about the number of actual corals, not rock, are collected vs. the number of corals left in that area to make that statement. Considering Borneman's and Veron's remarks for the species I mentioned it appears at least to them that the hobby has no impact on those species, the ones of interest to me personally.
As for fish, buy captive bred and the issue is resolved. Also, there are areas where no cyanide is used, buy fish from those areas as much as can be determined, I have been told that no cyanide is used in Fiji, Tonga, Marshall Islands, Hawaii, Sri Lanka, and maybe other areas--don't know this for a fact as I have never been there to see myself. A Local store gets fish from the Indian Ocean (Sri Lanka) weekly through a wholesaler in LA and these fish are supposedly net caught, the weekly list he gats says net caught (I know this is no real proof, but some evidence), they arrive without any mortality to him and I have personally seen these fish eat immediately and appear to be very healthy, the store owner says that he has not had a customer report a death thus far in about a month of getting these fish so I assume they are in fact net caught. Anyway, my point is that hobbyists can find net caught or captive bred fish.
Again, corals are not collected with drugs so trying to bring the discussion back to saying cyanide destroys corals is not valid in discussing proper coral collection, of course corals are destroyed when cyanide is used, but the cyanide is used to collect fish and not corals--this point gets back to the fish issue discussed above. Assuming larger coral collection businesses such as one famous one in Fiji are in fact profitable businesses, then I assume because of the number of years they have operated that they do practice well managed and sustainable practices for coral collection. Had their practices been haphazard and recklkess then they likely would have been gone from business long ago. Again, in their books Borneman and Veron do not feel that the collection of many coral species for the hobby has any significant impact on reefs. Technically an impact, maybe, significant impact--no, not at all, for most of all the popular aquarium species.
Seems to me the only real issue is cyanide collection of fish. Wholesalers and LFS weed out those shippers that do a poor job of handling/packing/shipping because the wholesaler and LFS must be profitable and they would not if they were always getting extreme mortality. Folks are working on the cyanide issue on this and other forums addressing it and are currently working on the issue and you can always buy net caught or captive bred. So, I see no need to beat up on yourself for being a reefkeeper, sleep well.