This tragedy while unfortunate is the result of life off the California coast.
These waters are sharky, and perhaps more sharky than anyone cares to admit.
It's also a testament to the white sharks ability to not choose humans as a prime prey source. After observing these animals for over 6 years now I have come to realize they will spend a lot of time "watching and observing" suspected prey items before attacking-most often they choose not to.
Off the shores of Nor Cal I often meet surfers who say they have never seen a white shark. My response is always "that's not to say they have not seen you".
White sharks very rarely make mistakes. This particular set up, with a swimmer in a black wetsuit, in the morning, along the shoreline, lagging behind a pack of other swimmers met more than one criteria for this shark to make a tragic mistake.
It is sad anyway you look at it.