allegations of bitcoin being used for untraceable money laundering

> Except perhaps(?) for banks that are willing to engage in criminal money laundering, and choose not to be part of any government mandated network?
A bank that is not connected to the SWIFT network will be rather useless, since it won't be able to accept wire transfers. It'll be limited to cash operations only.

> I don't quite yet (but perhaps i haven't thought about it enough) see how Bitcoin is the true enabler of the moneylaundering scenarios you describe. Please try to walk me through the details, illustrating a few common examples of historical non-bitcoin based moneylaundering techniques, as well as bitcoin ones.
It's quite easy. Basically, a bank is used as an intermediary for payments between fictitious companies, registered with fake documents. This is usually made possible by (usually intentionally) lax due diligence from the bank's side.

So when the law enforcement comes, they simply are not able to find who made payments and who are the ultimate beneficiaries of the fake companies.

Example: http://eng.lsm.lv/article/economy/economy/latvian-banks-w...