Principles that are mistakenly high and strict are a trap; they may easily lead in the end directly or indirectly to the justification of monstrous things. Thus if the evangelical counsel about poverty were turned into a precept forbidding property owning, people would pay lip service to it as the ideal, while in practice they went in for swindling. “Absolute honesty!” it would be said: “I can respect that – but of course that means having no property; and while I respect those who follow that course, I have to compromise with the sordid world myself.” If then one must “compromise with evil” by owning property and engaging in trade then the amount of swindling one does will depend on convenience. This imaginary case is paralleled by what is so commonly said: absolute pacifism is an ideal; unable to follow that, and committed to “compromise with evil,” one must go whole hog and wage war a outrance….
-G.E.M. Anscombe, War and Murder.