"When he got up to it he saw that it was a human hand severed at the wrist ... he kicked the thing into the gutter" (Orwell, 84).
"With a sort of military precision that astonished him, she outlined the route that he was to follow. " (Orwell,115).
"he could probably catch up with her. He could keep on her track till they were in some quiet place, and then smash her skull in with the cobblestone" (Orwell, 101).
This indifference and lack of empathy shown when confronted with proof of the pain and suffering of others is not usually shown in a hero.
The idea of not following the rules of society is uncommon in the protagonist. To do this and even with the intent of doing something wrong is very unusual.
The violent thoughts toward others, specifically killing an innocent person to protect himself is not what a typical hero would think or do. Most heroes are shown as selfless and only resort to violence to save others, not themselves.