I call bullshit. Even though Mt. Gox was grossly incompetent, it's hard to believe that they didn't have very basic accounting practices in place to catch this sort of issue.
Surely someone did audits and helped them do their taxes every year
So, I take it that you're of the mind that Bernie Madoff did his own taxes, and that Ken Lay and Jeffrey Skilling did Enron's taxes? Or that Henry, Emanuel, & Mayer Lehman would be doing their taxes? Arthur Andersen anyone? Ernst and Young? KPMG?
Financial regulation does not prevent financial fraud, or even slow it down. If you are willing to lie, you lie to your clients, you lie to your auditors, and you lie to whoever thinks they are regulating you. Then, you watch how often those that think they are regulating you decline to prosecute.
"Ja, Emanuel, I vas villing to lie und break zese 98 laws, to make zeven billion, but I vill not break 102 laws. ZAT iz unacceptable!!!"
Get real, fools.