These rogue traders are out there because their bosses don’t want to know what they’re doing. I never get a “rogue burrito” at Chipotle because the management wants people to get burritos that are rolled properly. But suppose the management wants people to obtain the kind of high returns that can only be achieved through unduly risky trades. Well, you can’t very well issue a directive telling people to make unduly risky trades. You certainly can, however, create circumstances under which incentives, control, and supervision are structured so as to make it the case that “rogue traders” will pop up here and there and then there rogueishness can be blamed ex post for undertakings that go badly.