In two forms
Violence in 1984
The man in the quote above shows the man giving up the safety and lives of everyone he knows just to save himself. He's choosing his survival over anyone else. It shows that when a human is faced with life or death, they choose life even if that means bringing harm to anyone and everyone else.
O'Brien smiled again. "She betrayed you, Winston. Immediately-unreservedly. I have seldom anyone come over to us promptly. You would hardly recognize her if you saw her. All he rebelliousness, her deceit, her folly, her dirty-mindedness - everything has been burned out of her. It was a perfect conversion, a textbook case." "You tortured her?"(3.2 32-34)
Although Julia loved Winston, when faced with being torture more or betraying him she choose to betray him to save herself. Julia did what she had to do to survive.