The part I underlined is not true. I have seen APBTs and bully breeds bounce back from being abused and not showing any aggression towards humans. Their love is unconditional as with any dog, but I see more so APBTs and bully breeds being hurt bounce back from it. That doesn't mean every bully breed out there is going to bounce back.
Also genetics plays a huge role in a dog's life, not the way they are treated.
Any dog can be aggressive not just pit bulls and GSDs. GSDs are much different than pit bulls as GSDs are a guardian breed, but a stable dog of any breed should not go after a human unless their person is being threatened I do not consider that aggression.
Human aggression shouldn't be tolerated in bully breeds, they should welcome everyone and make horrible guard dogs. Like I said the only exception I would make if the home or family was being threatened but that does not mean the dog should lash out. It depends on the situation. GSDs however are more aloof because they are a guardian breed and that is tolerated but they should not attack a person unprovoked nor should any dog.
http://www.pitbullsontheweb.com/petbull/pospress.html
Also there are a lot of pit bulls being therapy dogs, service dogs, etc. GSDs are search and rescue dogs, bomb sniffing dogs, and mainly in K9-Units.
I hope that made sense!
From atts.org passing temperament tests -
American Pit Bull Terrier - 86.0%
German Shepherd Dog - 84.2%
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