Not just the USA system. EU and especially German banks gave plenty of credits to Greek banks, knowing that they will probably spend it on German products, even if they have not much means to repay them. Plus, the EU knows full well that if Greeks overspend they can easily be pressured into austerity.

This went swimmingly for everyone involved, with Greece now in more debt than ever (debt went from 145.45% of GDP to 209.40% of GDP). And fascist parties going from virtually non-existent to mainstays.

Adding low-efficiency countries like those in southeastern Europe is great for the EU's major exporter - Germany, because it adds more customers who have Euros, and because it devalues the Euro, which means more exports. Better yet, because of Euro the new joiners can't devalue their currency and get their exports high enough to restart the economy, with only viable option being more in debt and/or leaving for Germany, while obliterating the local industries. Win-win-win. For the EU exporters.

So, yes, let's celebrate Bulgaria joining Hotel EU, where food is great, your bill grows exponentially, but you can't ever leave. By the end you'll just end up as a pool boy.