I don't know if they broke any law, my problem is with their morality. They understood the (corrupt) needs of the Greek politicians (avoid structural reforms and hide the resulting budget deficit for EU partners) and created a product specifically for that. This product was bad for everyone, especially the Greek people. The only one benefitting was GS themselves.
GS seem to have no problem screwing an entire population to make some profit. They don't care that the Greek or EU people ultimately need to pay for it.
This is a product created at the request of the (theoretically) democratically elected government of the Greek people. Sometimes clients ask for silly things, but the customer is always right, no? Nobody is suggesting that GS misrepresented the swap to Greece. What should they have done? Gone around the country asking random people in the street what they thought of the deal? That would be an awkward requirement to impose on companies seeking government business. (Should Lockheed cancel the JSF because the people probably don't need it or want it?)
No indeed! I'm convinced (and was taught in Technical University) that you always have responsibility yourself. Bad things [1] happen if you do anything someone asks of you / pays you for.
GS seem to have no problem screwing an entire population to make some profit. They don't care that the Greek or EU people ultimately need to pay for it.