Well, even if we didn't have the Americans to help us out we would still need NATO to get a common military system, to coordinate our actions.

Furthermore, without the Americans we would se huge nuclear proliferation in Europe. To put it bluntly, most people don't think the French or British are as aggressive and badass as the Americans when it comes to the nuclear posture. Does anyone seriously think they'd risk Paris or London for Tallinn or Bratislava?

Europe would not be a safer place with Hungarian, Polish, Swedish and German nuclear weapons.

Peak oil is not an energy crisis. It is a liquid fuel crisis.