Then, they got lured into euro currency.
Actually - if you look back, the EU only let them in because they produced some figures saying that they were doing fine. Now we know it was all lies, but at the time, Greece wanted in. They certainly would have been better out of it from the very beginning, but their own greed ruined it for them.
You cannot suddenly convince a Polish person to call himself European first. I suppose the same applies to Greeks as well, and most citizens in European countries. Most people are not nationalistic but they do have a sense of national identity. And when you try to suppress it, you get nationalism.
Poles are among the most European of the lot. Haven't you heard the demands to be considered an integral part of central Europe? Haven't you seen the massive amount of participation in European projects? They still identify with Poland first, but we all do - being European exists alongside nationality. Anyway, the EU doesn't suppress it - it encourages it. If it didn't, why does the EU have a massive bill every year for translation?
When you see countries like Belgium striving to stay one piece because of their languages, what are you actually thinking? That you can make a peaceful nation out of so many different and unequal countries, with 15-20 different languages? I think they are forcing things too much, too early. And it became very obvious during the last years.
The thinking is logical - everyone plays by the same rules under the same environment. It's not quite there, but look at how Schengen has caused many communities to function as one. Go to Gorlitz/Zgorzelec, or Irun/Hendaye - these places are operating as one, not two. Borders are vanishing before our very eyes. As the EU evolves, barriers will fall and people will mix more and more. It's no bad thing. Languages are encouraged in the EU and diversity is embraced. I wrote a letter to my local MEP once asking if I could use my own minority language (not English) in correspondence with her - and she replied positively, saying that it would take time to get the translation done, but they were happy to reply in my mother tongue if I wanted.
But hey, the financial agenda keeps going. Lets have a crisis and then ask for a unification, it's an old trick.
Self inflicted crisis, you should add. No-one made the Greeks borrow all that cash.