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Your article illustrates pretty neatly why professional ecologists are so annoyed by the "balance of nature" fantasy. That theory about Orca's eating the seals and causing a trophic cascade is a very lovely story and was a very clever hypothesis when it was proposed, but it has since been shown to be demonstrably false. Of course, the fact that it never actually happened has not prevented you, or many others, from repeating it as fact. In the history of Ecology, there have been a lot of theories that survived way past their expiration dates largely because they fit into the "balance of nature" worldview. As a scientist, I believe that it is far more useful to understand how nature actually works than to pretend that nature is a simple and moral.
