That assumes trust in the Greek government to actually do what it's supposed to do.
Which I would suggest is a big part of the problem. There are a previously established patterns to Greek governments. The risk is simply that a proper bail-out of of Greece around 2009-ish would just require a new 2024-ish repeat bail out, etc., etc.
You might be economically literate, but the bits that this sticks on tend to be political, and about risks.
Also, would it have been preferable if the EU had manned up and handled the post-Lehmann Brothers situation as a banking crisis, resolving it like one by nationalising insolvent banks, AND doing this in an EU-wide concerted effort? Absolutely!
Could the EU do that in 2009? Hell no!
The EU is not the US federal government. As a consequence of the crisis the ECB has by now been retooled into something more capable and functional than the simple anti-inflation mechanism the Germans had always insisted was be be-all, end-all of the ECB up to that time. So back then, not a chance...
The problem was not Greece, but the much larger Italy.
Any solution for Greece could not be a precedent for Italy.
But still that was possible without really affecting the financial status of the triple A countries of the EU (Germany, the Netherlands, Denmark, Luxembourg), with a lesser amount for the AA123 countries (Austria, Finland, France, Belgium):
I do not have ofc the list of all Greek and Italian bonds of say 1990 onward with all the interests paid, so I have to guess....
(Greece is around 1992 already in a dire situation, so you have to start somewhere 1990)
But with that guess... the grand total of interests adjusted for the historical inflation (which is the profit of the money lenders) for Greece and Italy was imo well within a healthy reach to pay for by the triple A and double A countries. That debt relief for Greece, Italy, would not really have affected their own interests to pay on new bonds needed because of that action.
And taking over for at least 10 future years renewing bonds for the existing debt at inflation correction only also well within financial means of the rich EU countries.
And ofc conditions to prevent building up new debt. And ofc an economical plan forward (finance cannot grow economy if there is no real base economy).
And that would have reduced the debt of Greece to the actual amount of money they pumped over those decades since 1990 in their economy.
And they would not have to pay for any debt caused by profits of any investor in their bonds.
The 4% Greece pays now on new bonds on the market is a waste of EU money, is onley making big wealth more wealthy (the triple A EU countries are paying far less than 1% on new 10 year bonds)
All the emotional arguments that banks (of other EU countries) and big money (of other EU countries) are benefitting from Greece etc are evaporated.
(the only thing remaining that public money needed to be used to pay private profits... except that 107 Billion Euro that was defaulted)
The Greece, or EU mess in this case, is imo an emotional mess from both sides, and not at all reflecting prudent Finance.
And back to Brexit.
The emotions in the UK are such that financial and economical realities are completely overwhelmed by emotional politics, practised by politicians, by newsmedia, by the people.
By betraying leaders of their country.
In that sense the UK is heading for a similar disaster at a smaller scale.