If Greece defaults and Grexit follows, the Greeks will find to their horror that their suffering can still get worse. If the EU lets this happen, it will be making its worst mistake since the creation of the euro.It is unfortunate Bloomberg doesn't clarify how a Greek default will damage EU interests. It isn't likely a defaulted Greece will throw in with ISIS or Turkey, maybe with Russia?
I imagine the EU's leaders would like to be rid of Greece. They may think it is worth the drama to teach other economically slovenly nations a lesson. How is it the "worst mistake since the creation of the euro?"