Just as with elephants who lose parental role models and exhibit out-of-character behaviour, I am sure that sharks found in strange places are suffering the same problem, usually human created.
I have noticed that commentary regarding shark attacks on people, mentioned that the animals were often of an age in the transition between feeding on one type of thing, to feeding on bigger fish.
Perhaps having lost their adult role models they make more mistakes and try to eat the odd human during the learning process on their way to adulthood.
I hope the experts take note of this fact and stop wondering why this is happening. We all need our parental role models.
We can’t go about killing animals, oblivious of the impact on the young who survive the death of their parents.