There most certainly is something about Greece.
If you have Firefox as a web browser, I suggest you have a look at the little bar that pops up when you hit "Ctrl + F" ... note the two citations, one for Der Spiegel and the other from USA Today, in the below section...
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Goldman Sachs between the years 1998-2009 has been reported to systematically help the Greek government to mask its national true debt facts.[72] In September 2009, though, Goldman Sachs among others, created a special Credit Default Swap (CDS) index for the cover of high risk national debt of Greece.[73]
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By assisting Greece in hiding this information, the apparent level of risk of the debt was lower; people who bought Greek debt as a consequence under-priced the risk. This can be demonstrated by reality, as when the info got out, Greece's cost of borrowing went up rather than going down.
Therefore, GS' involvement in this matter led to investors losing money they otherwise would not have, which is ... unethical.
Helping a country or company withhold information that is known to be material from investors, is unethical.
No different than telling someone the tires they are buying are rated to last 60K miles when actually they are only rated to last 30K, except you have blotted out the big sticker on the tire that states that.
That the SEC, as for example in the case of Madoff, was told explicitly for years beforehand of the fraud, and did nothing, is a matter of public record.
A more skeptical person might therefore wonder what else the SEC is remiss at investigating. However you have the right to be incurious if you so choose.