Turns out all those tough exams and practices are in place to mitigate this exact scenario.
The above assuming no malicious intent on part of MtGox and the recent revelation was pure stupidity.
Would an accountant know enough to safely store "wallets", to monitor "blockchains". Is this in their training? No. You can have perfect accounting and still turn out you lost the wallets.
Bitcoin's problem is that there's no other asset in human history so easily misplaced, lost, or stolen. A bunch of numbers on a bunch of vulnerable computers.