"In the evaluation of the package provided in 2010, the IMF said: "Given the danger of contagion, the report judges the programme to have been a necessity, even though the Fund had misgivings about debt sustainability.
"There was, however, a tension between the need to support Greece and the concern that debt was not sustainable with high probability (a condition for exceptional access).
"In response, the exceptional access criterion was amended to lower the bar for debt sustainability in systemic cases. The baseline still showed debt to be sustainable, as is required for all Fund programmes."
In the event, the report added, the Fund was open to criticism for making economic projections that were too optimistic."
Worth noting that the "mistake" was just in the projections of how much hardship it may cause. The report seems to still confirm that the action was needed under the conditions Greece faced.