-There's this slogan meant to illustrate a principle in game theory: "Don't negotiate with terrorists." Imagine you're a political leader and terrorists have taken some of your people hostage and promise to release them if you meet their demands. You should refuse the deal, the argument goes, no matter how much you desperately want your people back safe, because agreeing would create an incentive for the terrorists to take more hostages; if you're the kind of agent that pays ransoms, blackmailing you is a reliable profit opportunity (["For the end of that game is oppression and shame, / And the nation that pays it is lost!"](http://www.poetryloverspage.com/poets/kipling/dane_geld.html)).
+> It is wrong to put temptation in the path of any nation,
+>  For fear they should succumb and go astray;
+> So when you are requested to pay up or be molested,
+>  You will find it better policy to say:—
+>
+> "We never pay <em>any</em>one Dane-geld,
+>  No matter how trifling the cost;
+> For the end of that game is oppression and shame,
+>  And the nation that pays it is lost!"
+>
+> —["Dane-Geld"](http://www.poetryloverspage.com/poets/kipling/dane_geld.html) by Rudyard Kipling