Either a lot of morons on this thread, or liars.
Regardless of the likelihood or not of an attack, most normal people would have a healthy fear. I say this as someone very, very comfortable with animals (have worked with many species of dangerous wild animals in my time), and tend to not have the normal fear that people usually do (and should have) with animals capable of great harm.
Wild Orca's don't have a habit of attacking humans either, yet most commenting would shit their pants if one swam by them whilst they were taking a dip. I would be more nervous of a pack of wolves within a decent vicinity, than an orca (or shark), regardless of their secretive and shy nature.
Three species, out of all I've gotten close to, give me the true heebie jeebies. Polar bears, chimps and tigers. None of these I've enjoyed turning my back on, even with bars between myself and the animal.
Very easy for folks on mumsnet, mainly from safe little Britain, and most having never had any sort of close encounter with any dangerous animal, to ridicule someone having come across wild animals, whom would be able to do nothing at all about it if the animals chose to attack. Extremely unlikely, but not impossible.
Don't worry OP. Whilst a couple have posted sensible and somewhat knowledgeable viewpoints, the rest are obviously people missing an IQ number or 20. Mind the video of the family getting out of the car to take pictures with Cheetah's? Think along those lines.