You are correct in some of what you post, however, before we get too "politically correct", the fact of the matter is shark finning is done mostly to provide for the asian market, primarly Chinese (its traditionally consumed at weddings, and to not serve it is seen as an insult to the guests). Its also eaten as a status symbol.
In Asia, Rhino horn (and tiger penis, for that matter) is used for sexual potency - shark cartalige, popular as a suppliment in the USA, is also somewhat to blame - they have in common that they don't work; any benefit by the user is mental. But as a result, animals are slaughtered needlessly.
I'm all for respecting someones culture, but not for reinforcing ignorance.
I think we would have more whales killed if we had not had a strong condemnation of commercial whaling.
During my short lifetime (I'm 54), african americans rode in the back of the bus, attended segregated schools, drank from separate water fountains, and sat separately from whites, to mention just a few of the wrongs 14% of our population sufferend not very long ago.
Our society changed, and advanced, and frankly, certain Asian society's need to do the same thing, and start to realize that just because and animal "has its back to heaven" does not mean its fair game to consume.