Actually the sovereign debt crisis in the Euro zone is caused a) by the socialization of public debts aka bail-outs during the financial crisis,
Would not have been as big of a problem if poor countries like Greece, Italy and Ireland were not part of the EU. I am not saying the problem would not exist but if the EU was limited to countries closer to France and Germany's economic strength it wouldn't be as bad.
b) a pseudo gold standard inside Europe which makes it impossible for European countries to conduct an independent monetary policy which would enable them to devaluate their currency to get out of deep sh*t and
Which would not be a problem at all if the EU didn't exist at all.
c) the unwillingness of the ECB to play the same role as the Fed, be a lender of last resort.
I agree with you here.
Such institutional mistakes have nothing with "uniting countries that never should have been united in the first place."
The "mistakes" would not have been able to happen if Eurocrats were not pushing for a united Europe in the first place. I used quotation marks on mistakes because I am not convinced they are, especially when it comes to forcing the public to pay of debt. Eurocrats are trying to erode the middle class intentionally.