Answer:
I don't think so. It's a coincidence -- maybe. But it's a fun question to answer.
Explanation:
Comment
So ice cream on this particular beach causes more sharks to come closer to shore and attack. That's the premise.
I'd like to say it is a coincidence, or the data is biased in some way, but there is no way of telling without checking out the stats (which I would guess there are none).
Perhaps sharks like sugar and lot of someones drop their ice cream cones in the water. It's a test. Or it could be made into one.
Perhaps the sharks are annoyed by the ice cream and take it out on the person holding the ice cream. Again it's a test.
Perhaps they smell the ice cream and are attracted to it. I wouldn't want to test this with offering a shark a sugar cube put in water.