Re: If he goes to the USA
Actually, a friend of a friend was involved in one of the recent banking scandals (not LIBOR, but similar). As I understand it he was promoted sideways into a new role and 4 weeks later the team were charged with fixing the market - he clearly had no idea and had quite possibly been rotated in to take the fall.
Short version is he fought extradition for a long time on the same presumption, that there's no justice to be had for a european banker in the US. His former employer didn't support him financially in this so he eventually ran out of money to fight it, was extradited, got to court and was promptly acquitted.
He's back in the UK, considerably wiser and no longer working in finance. So it doesn't always go the way you expect it to.