That hasn't been my experience. I did a shark dive in Honduras this past June. It was great, there were lots of sharks, and the sharks didn't mess with the divers. I can't wait to do it again, honestly.
We didn't see any of the "big boys" though (no tigers, whites, etc). I'd probably have been uncomfortable if they were tigers - especially after having read about this attack.
That's not what I'm referring to. Your contract with fed sharks was at the shark feeding site, you were sitting with your back to the wall there and the sharks are being fed from boxes, the sharks being fed like that have been conditioned to understand the food comes from a box and their attention is on the box not the divers. They also associate that site with being fed so the sharks have a strong attraction to that sight they also have developed the open and closed for business mentality with that feeding they know when it's feeding time and they know when its over, you'll notice that once the food is gone so are the sharks starting to disappear. That's a much different situation then facing sharks in open water who have been fed by a dive boats that chum them or is shooting fish and feeding them which is even worse than just chumming.