Things we have learnt in Western Australia -time of year and water temp below 17c is a common factor in the recent years "incidents". Time of day (dawn, late afternoon/sunset) and weather conditions play a part.
So, if the water temp is under 17 like now and the day is overcast I can either wait out the week because there's no sunshine forecast for a week, or drive down south where it's even colder but there's blue sky forecast on Wednesday so I should be fine, or drive 1700km to Ningaloo where we have whalesharks too and the waters too warm for whites and tigers. I'm personally more bothered by tigers due to my dads buddy being a fatal in the 60s and I've only ever seen one GWS while diving here - a juvenile but still impressive. It did absolutely zero, just cruised past doing whatever it is GWS do between meals.
I have another theory - being bitten by sharks is a heriditary condition that skips a generation - father and nephew have been bitten by wobbegong and black tip reefie baby respectively. There is most likely zero evidence to support this theory.
There is some truth in that saying it's the ones you don't see ....