The FDIC is suing big banks over a tricky form of derivative, interest rate swaps, which were rigged through the LIBOR lies.

Aside from the falsification of LIBOR, banks should not be allowed to invent complex financial derivatives because that's a recipe for suckering people. If the bank can make up a game with complicated rules, it is almost certain to win the game even if the game is not actually rigged.

Banks are regulated and licensed businesses; they cannot cite "Buyer beware, especially if you're buying form us" as an all-purpose excuse for inventing gambling games that endanger the public.