Re: Avoiding war
We have avoided war simply because the last big one was so bad. Germany, France, the UK and most of europe were, if not physically devastated, at least mentally devastated. There was no appetite for war on a grand scale after a certain point in WWII (or the Great Patriotic War). Churchill proposed war against the USSR, but the UK was exhausted. The division of Germany (don't forget French administered Saarland!) was a punitive measure to keep it in check*, but it I believe it was unnecessary for ensuring peace.
True there have been many skirmishes since then involving the European powers, their empires and colonies (Algeria, Vietnam, Malaya, Dutch East Indies, Kenya, etc) and Korea, but rarely anything on European soil until Yugoslavia erupted. And even then it was kept pretty contained.
New generations are growing up now in Europe who have not known war and its horrific destruction, but who may feel disenfranchised and burdened by the economic policies of the euro-elite. It's unlikely, but a peripheral nation like Greece or Portugal (or even Spain), suffering hardships could decide that a war may be preferable to mass unemployment. Perhaps a new great bulwark against future war in Europe may be from refugees of African and Middle eastern conflicts who have settled here and do not want to see more war.
* Not sure who's idea partioning Germany into east and west was, but the Russians arguably had more reason to be punitive than the US/UK (though Thatcher still wasn't hot for re-unification after the Berlin Wall fell)