In my "third world" country we used to destroy these gentle sea creatures for survival. But now we have learned to take care of them because we finally realized that our chances of survival are greatly increased when the survival of these gentle creatures of the sea are also assured.
When one is forced to destroy nature in order to live, it's one thing. It's another thing when one's overwhelming desire forces nature's destruction. The former may be called survival, but the latter is called greed.
It's neccessary insticnt for one to want to survive; it's his foolishness that survives his unneccessary want.