The calculus of terrorism

From The Guardian: "Terrorists calculate that when the enraged enemy uses its massive power against them, it will raise a much more violent military and political storm than the terrorists themselves could ever create. During every storm, many unforeseen things happen. Mistakes are made, atrocities are committed, public opinion wavers, questions are asked, neutrals change their stance and the balance of power shifts. The terrorists cannot foretell what the result will be, but they have a much better chance fishing in such troubled waters than when the political sea is calm."