In the many, many years and various locales that have done shark feeds, I can only recall one fatality and a handful of bites. Given that any encounter with sharks can be problematic, I think the safety record speaks for itself. Let's be realistic that diving is intrinsically dangerous. You endanger yourself every time you descend, so there is no way to make diving completely risk free. Why then should we expect risk free when we introduce apex predators? Most of the videos of divers being harassed are of spear fishermen. Should we stop all spear fishing because they seem to have the preponderance of negative shark encounters? Like diving, it's a risk accepted by those who participate in the sport.