"The ends justify the means." –Niccolò Machiavelli.
A more literal translation, according to Peter and Julia Bondanella of Indiana University, is "One must consider the final result."
Fundamental attribution error: A tendency for people to over-emphasize personality-based explanations for behaviors observed in others while under-emphasizing the role and power of situational influences on the same behavior.
Operation Wrath of God:
After the Terrorist group Black September kidnapped and murdered 11 Israeli athletes during the Munich Olympics in 1972, the Israeli intelligence agency Mossad decided to seek revenge under Operation Wrath of God. During this time, covert Israeli assassination units killed dozens of suspected conspirators across Europe. The string of assassinations spurred retaliations and criticism of Israeli. The film Munich outlined these events.
Sources: Wikipedia and Listverse