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I'm not fully educated on Hawaiian culture, and don't really understand the surfer's and fishermen's objections. If there were no shark-related injuries due to shark tour boats feeding sharks, and if the shark tour boats weren't breaking any laws, then what is the problem? An increase in shark activity may lead to a decrease in fish populations, but not necessarily because fishes are being eaten. Irrespective of the conflict, the tour owners hardly "brought it upon themselves." Fire on a boat is a very serious matter!
At this point in the tug-of war over sharks, I'd have to say that any venture that promotes interest, intrigue, or understanding of sharks is A-OK with me. And feeding sharks will never 'tame' them. When the food runs out, I seriously doubt they will stick around and starve waiting for the next handout.
It seems to me that these folks need to agree to disagree and get on with life.