Most of the world has the impression that sharks are all dangerous killers and to a certain extent the way they are treated by us only fuels their own fear and distrust. In the wilds of the sea these animals are just looking for their next meal, just like wild dogs. But just like with ancient man, dogs learned to have a mutual relationship that developed into a trusting dependency.
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Hawaiians had pet sharks that protected families. This could be done again to protect our beaches.
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As with dogs that learned to live by early humans and then become part of the human family,
sharks could be trained from "pups" (which is what baby sharks are called) to be human
friendly with no instinct for eating human flesh. This was due to being hand fed and
petted just like today's dog companions.
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Developing a friendly relationship with a shark would require hand feeding from pups but could be a Hawaiian cultural project.
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http://honouliuli.blogspot.com/2015/01/ewa-honouliuli-shark-caves-gods.html