See if you can spot the pit bull on this web page. This is from http://www.pitbullsontheweb.com/, a great site to learn more about the American Pit Bull breed. I know a lot about dog breeds, and I only got it right on my third try. (Yes, there are many breeds pictured that are not popular in the U.S.) While many cities/insurance companies are considering breed-specific ordinances/restrictions that penalize pit bulls and their guardians, this web site highlights the fact that most people cannot recognize a pit bull when they see one.
I believe any dog breed can be aggressive and a danger to society at large. Breed-specific legislation targets the dogs, not the people who are really the problem.