As I write, highly civilised human beings are flying overhead, trying to kill me.
They do not feel any enmity against me as an individual, nor I against them. They are “only doing their duty”, as the saying goes. Most of them, I have no doubt, are kind-hearted law-abiding men who would never dream of committing murder in private life. On the other hand, if one of them succeeds in blowing me to pieces with a well-placed bomb, he will never sleep any the worse for it. He is serving his country, which has the power to absolve him from evil.

George Orwell (1903-1950) English journalist, essayist, writer [pseud. of Eric Arthur Blair]

Essay (1941-02-19), “The Lion and the Unicorn: Socialism and the English Genius,” Part 1 “England Your England,” sec. 1, The Searchlight Books [ed. Fyvel and Orwell]
    (Source)

Part of Part 1, "England Your England" with the title "The Ruling Class" was previously published in Horizon (1940-12).