If everything that they're saying is true, then no, I think they acted in self defense and did the right thing. They said that they swim with sharks all the time, sometimes 10+ feet long, sometimes groups of 100 of them. They must know how to handle sharks very well. And they said, "We really wanted to have a different outcome here, but unfortunately that wasn't possible." What were they supposed to do, draw out the fight for longer than was safe and risk their lives to save that of an animal who was trying to kill them? They did what they could to avoid the situation.

But, that's only my opinion based on the video that you linked to. I don't know the people, their backgrounds, their credibility, etc. There could be a lot of information that I don't know which could change my thoughts.
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Sharks are highly evolved killing machines. A tiger shark is second largest predatory shark (after the great white shark). The tiger shark is second only to the great white shark, coming close to the bull shark in number of recorded attacks on humans and is considered, along with the great white, bull shark, and the oceanic whitetip shark to be one of the sharks most dangerous to humans. The tiger shark is responsible for a large percentage of the fatal attacks that do occur on humans, and is regarded as one of the most dangerous species of sharks.The shark is known to be aggressive and because of its aggressive nature of feeding, it is common to find a variety of foreign objects inside the digestive tract of a tiger shark. Some examples of more unusual items are automobile number plates, petroleum cans, tires, suits of armor, and baseballs. For this reason, the tiger shark is often regarded as the ocean's garbage can.

This shark was 15 feet from them and in the clip you can see it swam at him directly. These divers are not at fault in any way. They were about to become part of the food chain and given the experience of the divers and the nature of the fish they acted correctly. I know if I was under the water and a one ton killing machine strafing me I would have killed the fish and would have been in dire need of a fresh wetsuit. From what I saw the men were not stabbing at the shark with diving knives enjoying the experience or acting in any way that suggested they were doing it to be malicious. The diver never abandoned the shark in the whole process. Which given the nature of other sharks to detect blood in the water says something about the nature of the divers. Having worked with aspects of the forest service I can and do agree with egoods assessment on the nature of bears and I would agree they are excellent parallels. Though I will defer to his experience diving as I have never done that. But I do know sharks are predators just like bears are and if they decide you are on the menu sometimes you have to take drastic and unfortunate measures to ensure your survival. I know there are a lot of people who love animals out there. But, given the choice between a human life and a living animal I would choose the human life every time without hesitation or reservations.
Source(s):
http://en.wikipedia.org/wiki/Tiger_shark
http://www.flmnh.ufl.edu/fish/Gallery/Descript/Tigershark/tigershark.htm
http://marinebio.org/species.asp?id=37
http://www.nmfs.noaa.gov/sharks/FS_Tiger.htm
http://www.flmnh.ufl.edu/fish/sharks/Statistics/species2.htm
Daley, Audrey (1994). Shark. Hodder & Stroughton. ISBN 0-340-61654-7
http://www2.hawaii.edu/~carlm/tigershark.html
http://www.sharkinfo.ch/SI1_99e/attacks2.html

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