If in the 1930s nuclear weapons had been invented and the Allies had been faced by Nazi SS20s and Backfire Bombers, would it then have been morally right to have handed Hitler control of one of the most terrible weapons man has ever made? Would not that have been the one way to ensure that the thousand year Reich became exactly that? Would not unilateralism have given to Hitler the world domination he sought?
The European single currency is bound to fail, economically, politically and indeed socially, though the timing, occasion and full consequences are all necessarily still unclear.
What we should grasp, however, from the lessons of European history is that, first, there is nothing necessarily benevolent about programmes of European integration; second, the desire to achieve grand utopian plans often poses a grave threat to freedom; and third, European unity has been tried before, and the outcome was far from happy.