Fifteen years ago would be the very beginning of the 'pit bull' problem. 1999 is the first year I find reports of a pit bull killing anyone, and even then, Rottweilers were the principal killers. For years, Rottweilers were the main killers, followed by German Shepherds. Before that, it was German Shepherds.
It wasn't until 2004 that pit bulls caught up with Rottweilers as the principal breed(s) causing human deaths, and since 2005, the three 'pit bull' breeds and mixed-breed pit bulls are overwhelmingly the most dangerous breed (with Rottweilers number two) for human deaths.
When breeding and ownership of American Staffordshire Terriers was in the hands of reputable breeders and non-thugs, that breed was not a problem.