There not going to tip people over and eat the snacks inside. come on...
The reason we know about shark attacks is that fact we find whats left of the person after the fact. Sharks dont like the taste of people, Our blood content doesnt have enough fat in it. Well thats for most folks on this forum... unfortunately If the Taxman takes a bite out of me he might not leave me alone! But Im prepared for that situation. which will likely never happen.
Those Norcal guys see bigger Great Whites and are subject to more attacks becuase of the food there. Those Elephant Seals and stuff are big. So if the sharks cant get ahold of a baby, they will get over ambitious. Thus many of the Great whites will be larger. big fish, big food!
But thats not likely a problem down here.
Most of the whites seen out here are juveniles, or young adults. under 18 feet. Most of the sitings of people claiming they are 25 feet long is just a fast haeartbeats stretch of the truth. besides an X-factor is 14 feet long.... and most of the kayaks out there are longer. IF you get hit by a shark youll most likely never see it comming and you almsot surely will get thrown out of the kayak.
You think the sharks swim nonchalantly around the seals before they decide to eat one? no, seals arent stupid. If you see a great white he already has seen you. and if he stays around. hes just curious. Theyd put there hands out and touch you if they could... bumping the kayaks and touching it with there nose witch is the most sensitive part of there body. Thats how they figure things out.
Red and yellow and bright colors are what may get them initially curious. active paddling will make them curious as well im sure. But truthfully inside your kayak, your much larger to them than you think. And you really have little to fear. Thats why we have "close calls"

shark reports... IF the shark wanted to eat you. he would have.
Its rolling the dice just like anything youd do. Lightnin'! will hit ya more likely than a GW will. The media makes a bigger deal of it than it is.