I always wonder why fishermen like yourself are so fearful of the ocean and its creatures. I've been damn close to whiteys--that's my photo of the shark, dude, not some Internet grab. I've got more pix from closer. Yeah, they bite, but so do pit bulls, lions, grizzly bears, and inner city hoodlums, all of whom I've also been damn close to.
Interestingly, Rodney Fox, after surviving a near-fatal shark attack, has become a vocal advocate of shark conservation. These fish are apex predators, they are threatened by long-lining, drift nets, and finning operations, and the oceanic community needs 'em. If they snag a human now and then (gee, there are only seven billion of us), I don't think that is such a big loss.
Back to fishermen and their fears: I suspect it's the bad karma you guys collect killing so many fish. Also, going out to sea in a boat is not the same as diving and surfing, where you are in the water. You're taking a bit of land out with you by standing in the boat. You're still, in a sense, on shore.
Try immersing yourself sometime. You might like it.