How sad that you would end a friendship over some misguided fear of a dog breed, to each his own. And how odd that you dismiss anyone that owns a pit bull or has owned a pit bull as anecdotal information that isn't worth while yet you are absolutely convinced by media coverage of pit bull attacks, which even YOUR OWN SOURCES say are not responsible for a majority of serious attacks.
Bad owners create dogs that attack, there is no "bad" breed of dog as any legitimate expert will tell you, the problem is irresponsible owners who neglect or mistreat their dogs.
As far as being dangerous ANY large dog that has been bred for aggressive tendencies CAN BE dangerous...rotweillers, shepherds, Akitas, pit bulls, mastiffs...but no entire breed of dogs IS dangerous.
My sources, how about the Dutch government? They're lifting the ban on pit bulls because the incidence of dog bites was unaffected.
http://www.expatica.com/nl/articles/news/Dutch-Agriculture-Minister-scraps-pit-bull-ban.html
How about the British government, since their ban on "dangerous dogs" including pit bulls, dog bites have gone UP.
http://www.easier.com/view/Finance/Insurance/Pet/article-182721.html
According to the web site you linked to there were almost 400,000 dog bites that required visits to the hosital emergency room...why didn't we read 400,000 news articles on these dog bites?
There are also documented cases of golden retrievers who have maimed and killed people, so maybe you should consider calling up the constable and having your dog hauled away...just in case.
I feel sorry for you.