Grexit

I don't understand why they're still talking about this and proposing a third bailout.

For all the talk about the irresponsibility of the Greeks in borrowing money that they clearly weren't going to repay, nobody seems to be paying much attention to the European banksters who lent money without caring whether or not Greece could repay it. In a business or consumer situation, that ends with the borrower going under and the creditors getting largely stiffed; which is why when you or HexBoltCo wants to borrow money, the lenders look carefully at your assets and cashflow before deciding whether to float a loan.*

The larger lesson for nations is that if you want to retain a degree of control over your own financial affairs, have your own currency. The Eurobanksters likely fear that if Greece exits, that other nations will follow.** With their own currencies restored, those nations become in a better position to tell the dweebs in Brussels to sod off.

As some form of trade zone, the EU may survive. But as to the EU's proponents' dream that the EU would become the United States of Europe, they should put down the opium pipe.
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* The banksters' refusal to do that during the `00s is largely responsible for the `08 crash.
** Ultimately, they might as well change the name of the central European currency from "the Euro" to "the Reichsmark"