Former German central banker Thilo Sarrazin, whose musings on Muslim immigrants sparked outrage in 2010, has triggered fresh controversy with a book that paints Germany as the euro zone's hostage, forced to pay out vast sums to atone for the Holocaust. In his book "Europe doesn't need the euro", Sarrazin argues that the euro zone is holding Germany to ransom over its past aggression, blackmailing it into agreeing to euro bonds or mutualised debt.