I've seen sharks on many dives. I've dived with Great whites, and also with Tiger sharks, Reef sharks, Lemon sharks, Nurse sharks, and more. I've never been bitten by a shark. Here are some tips for avoiding a shark bite.
We find ourselves presented with an opportunity -- given the annual media festival that is Shark Week -- to better inform ourselves and to appreciate that we as humans have very little (if nothing) to fear from sharks.