Your answer is in what you wrote - despite being neither a Lawyer nor a punter, I'm pretty certain any action against "whoever is manipulating the market" is doomed to failure and my biggest concern today is that Julia and that smug w@nker Swan will read about Cyprus and think that would be a good idea here.
RVR,
Thanks for the Motherjones link, but honestly, did the Knight Capital part remind you of the Terminator plot as it did me?
As a species, I personally think we need to stop admiring (or envying) scumbags that strive to become obscenely rich without doing anything useful.