....One could argue that the resort should warn people that there is the potential for shark attack however, thats true anywhere in the ocean, even at a resort that has never had an attack in its recorded history.
Instructing people to not snorkel alone is good advice even if there hadnt been a shark incident and applies to all watersports, even skinny-dipping. But there have been documented shark-bites of surfers and swimmers who were with other people. As far as the resort equipping snorklers with some shark-deterrent device, it may make people feel better but in most cases would make no difference because most of the time they dont see it coming. The truth is most people swimming in the ocean flee the sight of a shark. I saw a wade fisherman run across the surface of the ocean like a biblical miracle because he saw a porpoise fin he thought was a shark.
My idea was for a camera that would also be protection...very different, when you think about it....the bigger issue, is that the resorts and your position as well, is that the best solution is to equip the public with "Ignorance".....
I think this is morally bankrupt. Even though you are CORRECT that many snorkelors will not see the SHARK near them ( even many scuba divers have very low peripherol awareness abilities, and don't see a shark unless a buddy grabs them and forces them to look in the right direction).....but, there will be snorkelers that DO have awareness of their surroundings, and that DO scan the horizon, and WOULD see the shark.
Sharks do not typically come straight in on first look to bite. Far more typically, they circle around to get a feel for wether the object they are curious about is food or dangerous to them, and this could be a substantial amount of time....With buddies, the chances of one seeing the shark go up alot, and the danger equation looks higher to the shark..... The ones with a buddy, and some awareness, would most likely have an excellent chance that they could turn what could have been a bite, into a fun video opportunity, with no injuries to anyone.....But the Resort plan is to remove this option, and the use of ignarance WILL cause some deaths. It will certainly not SAVE any snorkelers..... My solution could save aware individuals--and anyone has the right to this.
As to belly surfers and surfers in general, this can not be made to be safe, there is no reasonable way to have a two way interaction with the shark that can help the person. I'd let my kid snorkle with friends, all with the camera tool on pvc, but would NOT let them surf in places where large sharks are expected.