Safety, sharks and beaches

Shocked to hear of Mr Adam Strange's death in early 2013 at the beach near Auckland, New Zealand. Holding a funeral on a beach explains why the family went back. But my first reaction was that I don't think going back to a beach where somebody has just been killed is brave; it is recklessly endangering others and yourself and your own children.
Don't people learn. 139 attacks by sharks, 29 fatal. (NZ or worldwide?)
Swim in a swimming pool or on a beach which has a net across the 'harbour' entrance.
Shouldn't beaches have a safety number? If somebody has been killed the number is zero.
It seems they had lots of safety help, lifeguards, police helicopters firing, but still could not save the man.
Time for somebody to invent something new, such as swimming pools with tough barriers which float in the sea using sea water with walls against fish so they cannot see or smell or reach the people inside.