Injuries to people from captive animals of any kind nearly ALWAYS comes down to the fault of the owner of the animal, almost without fail. Be it a Pit Bulldog, pet alligator, Cobra, Tiger, Sabre-toothed Goldfish, whatever. The owner acted irresponsibly in some way providing an opportunity for an accident to happen. There are, of course, the rare instances when someone goes unauthourized into the domain of the animal and brings it upon themselves...you can't completely idiot-proof.
I agree also that Pit Bulldogs have gotten a bum rap. They are great dogs, just like any other dog can be a great dog in the hands of a responsible owner. By the way, the last time I heard, Cocker Spaniels had bitten more people than Pit Bulldogs. The big difference is that when a Pit Bulldog DOES attack, it is devastating. They are extremely powerful and tenacious animals.
The point is, I don't think the species of captive animal is important. The quality of the keeper is. As long as you are cognizant of the potential for danger that the animal carries, and act accordingly there should be no problems with any of them. Obviously keeping a Tiger in an apartment or keeping ANY large, powerful breed of dog unattended around small children is no smarter than keeping a Mamba in an aquarium in a day-care center. That all goes back to the stupidity issue.
The real problem is that these foolish acts that end tragically result in legislation that is putting a stranglehold on us. And, just as tragically, we are not organized to fight it.
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We do not inherit the Earth from our ancestors; we borrow it from our children. Ralph Waldo Emerson