There are any number of dogs than can be dangerous if not raised properly. German Shepherds, Akitas, Rottweilers, etc. Yes, pit bulls can be overly aggressive, particularly if they are not raised properly. In a good home, they are wonderful pets--two of my best friends have one, and it is as sweet as can be--provided that you're not another dog acting aggressively.
An issue beyond the question of breed is the number of dogs involved--the OP article mentioned seven+ dogs, and at that point, pack mentality takes over. My sister in law has a habit of talking in strays, and at one point had 5 in her back yard, all of indeterminate breed. One day they got out and attacked and killed a neighbor's dog.
Yes, it's a terrible tragedy, but there's no reason to eliminate an entire breed. If the little girls had accidentally shot herself, would you be calling for the destruction of all handguns?