svthom:
1. There is a significant increase in the numbers of GWS.
By your observation. This does not constitute a scientific survey. The more important numbers would be how many people are attacked by white sharks per year with charts going through the last few decades corresponding to statistics of humans entering the water (if 50 humans enter, 2 shark attacks is more significant than 2 when 50 million have entered).
svthom:
2. The number of GWS is getting too big related to the numbers of seals, so they have started migrating out of their traditional territory and into new waters. There are no seals around here, please give some theories about what a 5-6 meter long GWS will eat out of our beach. Shellfish?
Good question. My guess is you've got seals around there or you saw a shark passing through. If 5-6 meter sharks were changing their food source to select humans, my guess is you'd know it. Humans are not choice shark food which is why the vast majority of cases involve ONE bite and nothing else. This is not to "wait for the victim to bleed to death" since sharks are effective enough hunters that they aren't going to let a puny human escape if they're hellbent on eating it. We do not possess blubber, smell weird, probably taste weird, and are not an attractive food source.
svthom:
4. We take care, and stay out of the water. Kids are told that they cannot go deeper than their shorts. Dog in the water is a no-no. Surf-boards are placed in the garage. We do not dive anymore. The kids are not allowd to snorkel where it's more than a meter deep, so they do not do it, it's boring. The same precautions are made by everyone else too.
As I said, you are entering their habitat to recreate. I have less sympathy for this situation than I do for the competing habitats between humans and land mammals because at least humans are also land mammals who need to, you know, be on land and utilize the same resources.
svthom:
5. The african sun is HOT. Rich people can sit in air-cooled livingrooms, and dip thmselves into they garden pool. Poor people seek refugee in the ocean. Much because they have to. Thus making poor chum... Are you comfortable with that?
This is an unfair argument designed to play on guilt. First of all, kids being allowed to snorkel where it's a meter deep and being able to go in up to their shorts shows more than sufficient capacity to cool themselves. In addition, if you are worried about 4-6 meter sharks, you can probably even venture to the 5-6 foot realm. A shark COULD bite you, but the odds are a bit lower than the already distinctly low odds. I'd be more concerned about the kids drowning, which is a greater statistical probability.
Secondly, do all the poor people have summer houses and surf? I may have a different standard of poor, but I have a summer and winter apartment that occupies the same location, which to me, makes me poor in comparison to anyone that can use the word "summer house". But I dive because I love diving, not because I am trying to cool off in the excruciating Sacramento heat (110 degrees during some days). It's also hard to believe that the only public water source is totally unprotected areas of the ocean that harbor white sharks.
Like I said, I'm in another hotspot. I'm also not someone who enjoys a great deal of danger, so I am not "brave" to dive in an area that is some 26-40 miles from the feeding grounds of some of the largest white sharks in the world (Farallon Islands), nor would I be 'irresponsible' to my family if I had children. My ex had kids and we were quite comfortable renting wetsuits for them and letting them play in the water. The biggest danger to children in the entire area is probably Monastery Beach, not great whites. Can't remember the last child who got tagged along the coast compared to the tons who enter the water... Not to mention the number of kids in Hawaii (though a 13 year old got bitten) which attracts millions of swimmers, divers, and surfers to tiger shark "infested" waters.
Conclusion:
svthom:
The number of GWS have to be under some kind of control. How about defined GWS teritories? Game fishing outside these..? If GWS population gets out of control, people will start killing them on their own, wich is not a welcomed situation.
Who tells the great whites where the territories are? They have a wide range. All you have to do to really pick them off is just sit outside the "boundary limits" around seal colonies. If you're defining territories by beaches that have high human visitation, then do you think it's a good idea to fill the water with the amount of blood and distressed fish calls that it would take to land an adult white shark near where humans gather?
If we're talking about non-invasive measures to protect public beaches, I have no trouble with it, such as electrical or magnetic fields in the area, since nets kill all kinds of things, but shark culling? Doesn't work historically, depletes the population, hits the apex predators and really does nothing but provide a feel good for the population who is in the same minimal amount of danger that they were beforehand.
If you want to protect yourself for the sake of your family by restricting the things that are the most statistically likely to kill you, exercise frequently, avoid fatty foods, don't smoke, don't drink, don't drive, don't do household repairs, especially not that involve ladders, don't live in urban areas (crime), don't live in rural areas (predation, disease), don't live in areas with any sorts of natural disasters, avoid water altogether, definitely avoid diving, and so forth.
By the time you get to sharks as a probable cause of death, even adjusting statistics to specify people who actually enter the water (versus someone's odds of getting nailed by a shark when they never go to the ocean), you're probably living in a fiberglass bubble eating cream of wheat.