Although it's horrific to hear that somone has been killed or attacked by a shark, the stats show that on average only 3 people are killed each year from shark attacks. If people were really concerned about saving lives of humans it would make more sense to focus on activities that kill much more people each year, than trying to cull sharks to reduce shark related deaths.
Globally and in Australia there is a trend of increasing shark attacks and deaths. Experts say this is more likely due to an increasing global population and more people enjoying water based activities, more so than a m