"It is the madness of folly, to expect mercy from those who have refused to do justice; and even mercy, where conquest is the object, is only a trick of war; the cunning of the fox is as murderous as the violence of the wolf." -- Thomas Paine (The American Crisis, No. 1, 19 December 1776)

Reference: Thomas Paine: Collected Writings, Foner ed., Library of America (97) Just seems like something to keep in mind regarding our jihadist enemies...