I don' t have the same sort of background as you, but as a businessman I wouldn't have those so called managers about me for very long either. I would have fired them long ago and got someone in who knew what a manager was supposed to to.
I do have some sympathy for Nick, he was one man who had too much responsibility and had the emotional strains that we all need to face in the market. It is just when you deal in the sort of money that he did, then you do need people to answer to and to keep you in check. Sure he did wrong big time, but he is human and was alone.
Again in business I know that people make mistakes and do other things plain wrong. So, I try and put checks in place, an important error can't go far wrong without being picked up by someone before it goes badly wrong. No one person has control of important issues such as finance, order management, cash handling etc.
It's a bit like a stop loss. Even if you don't normally use a 'real' one (only mental), it is sometimes a good idea to put a 'catastrophic' fixed Stop Loss in place in case you have a heart attack with the excitement or something else. This sort of stop, though far away from where you actually intend to stop out, will get you out of the trade before emptying your account in the event of an unseen catastrophe.
Those managers didn't even know how to trade or read a set of accounts, how did they expect to manage a trader and his team?