Slightly off topic, but.....if Mouse is 25% Lovely Family Dog Golden Retriever and 25% Devil Dog Staffy, what does that make him - in the eye of the beholder?! 

Back on topic, of course any dog can bite. Any breed of dog can bite. Just as any child can, potentially, harm another (not comparing, just saying generalising bit pointless).
I saw the thread's OP as being about de-demonising a specific breed. But if I had a history of being attacked by dogs, I imagine it would have brought a few feelings up. Thats the way it is....if I read things about minorities being marginalised, about less than perfect people being judged, I bring my history in to my response (in a more or less aware manner, depending on tiredness levels!).
I'm not shocked or surprised by either the OP or by Rhubarb's upset feelings, but have to admit I don't get the bandwaggoning effect.....