Quoting the Crisis

No Mr Gruebel: there will always be criminals, there will always be people who want to steal from your bank or go to the casino on your dime. You cannot monitor all those people but you can and should build systems that are as robust as possible to human nature and when you fail to do that you fail in your job.

But worse: your statement that “you can’t do anything” is a statement that you are abdicating your duty. I hope that statement is misquoted because if I were on your board and you took that stance I would be seeking your resignation. To lose money to a determined rogue trader is an error - and all systems have holes. To deny you can do anything about it is to give up being a banker.