Jurisdiction is just a technicality. Let's set "Team America World Police" on the case!
To be fair, Americans aren't the only ones that assume US laws apply everywhere. I had a friend in the British Army military police and he said a few times he had squaddies say something to the effect of "I know my rights, I'm pleading the Fifth",'as if the fifth amendment of the US constitution counts for much in UK military justice. That's the power of Holywood for you.
Did the Fed bail out numerous foreign banks to prevent a largely US-engineered derivatives bomb from blowing up the planet? GS is doing the financial equivalent of selling plutonium in the Middle East, financing the purchases, and then hedging against their own plutonium customers with more derivatives.