dashark: I'm not trying to pick a fight, but I disagree a bit.
I was suggesting that in some locations it is uncommon to "encounter" sharks. They may be around, but are seldom seen by divers. Other locations are known for the presence of sharks.
Generally, the more aggressive sharks are not often found very close to clear, warm, shallow reefs, in my opinion. For example, it is my understanding that it is very rare to see sharks around Bonaire.
For someone who is fearful of sharks, seeking a destination where they are uncommon would seem wise. Of course, lakes, quarries and rivers are going to be shark-free (although the bull shark is capable of surviving in freshwater and has been found in lakes and rivers including the Amazon and the Mississippi) but since vtec mentioned shark cages, I gather he/she is interested in ocean diving.
I think it is sometimes all too easy for us to tell someone not to worry or get over their fear. If it were that easy, they probably wouldn't be talking about their concern. For some it may be snakes, spiders, flying or heights, for others, sharks. Some people have no phobias and for them these fears may seem illogical and even silly, but for those with the fears they are real and not easily overcome.
Telling someone with a fear of flying that they shouldn't worry because planes seldom crash doesn't get them over their fear.
I grew up in an area that has a lot of bull sharks and I don't think a year went by without someone getting bitten. I was only in the water around one once (that I know of), and I didn't like it. They make me uncomfortable and I won't knowingly dive around them. I think they are beautiful and would actually like to see one once while diving, but after seeing it, I would probably leave unless it did. I know others will intentionally seek them out and try to get as close as possible, and even feed them, and that is fine for them. I prefer to keep my distance.
I know that sharks exist in the locations where I dive, but it is uncommon to see them. I think it is valuable for someone who wants to learn to dive but has a fear of sharks to know that there are many locations in salt water where they are unlikely to encounter any shark, or at least anything more than a smallish nurse or reef shark.
Yes, we are entering their home, and it would be hard to completely rule out seeing a shark in most locations, but there are plenty of places where shark sightings are uncommon and I think that is worth knowing.