Don't confuse watching and 'enjoying' White Tip Reef sharks and Tigers. White Tips are nocturnal feeders and, unless harassed, are generally a non-issue to humans. Tigers on the otherhand are not particular about what they eat and can be VERY aggressive.
One statistic I came across a number of months ago, of all of the fatal and non-fatal shark attacks, about 50% are on surfers, 25% on freedivers, and 25% on divers (usually provoked). I am sure part of that is that there are more surfers than divers, but its also about being on the surface. The only time I really think about sharks are at the surface on a night dive. I would much rather be at depth than on the surface.
Otter
P.S. How is the shorediving on Maui? Last two years, viz was not as good as usual when we went over in August.