Consequentialism

Definition: Consequentialism is in ethics the principle and group of theories based on the idea that the consequences of an individual's or a firm's conduct are the ultimate basis for any judgment about the rightness or wrongness of that conduct.
As a result, it might be okay to lie or act unethically in order to generate a greater happiness.
One major consequentialist theory is Utilitarianism: An action is justified if it is generating greater good for all even at any harm.

More on consequentialism. More on ethics: Value Theory, Values.