Silence is Golden?

It seems from recent reports that the U.S. Treasury has been quietly investigating and freezing suspicious North Korean bank accounts since June in response to the sinking of the Cheonan; though not, it seems, accounts explicitly theretofore linked to the sinking, if such a thing could be said to exist.

Regardless, is this good? Well yes, overall it probably is. However, I take serious issue with this;

"The source said the new financial sanctions will be different from what happened in the Banco Delta Asia crisis that stalled the six-party nuclear talks for years due to the North’s protest. Instead of naming and shaming a specific bank as a money laundering institution and pressuring it to freeze North Korean assets, “quiet” moves are now preferred to avoid blowback from Pyongyang, the source said.

Another source confirmed the additional financial sanctions, noting that, “If the charges are very clear, then the Banco Delta Asia method will be used, while the silent method will be used in more ambiguous cases.”

Is this a shoddy translation? Can we really be suggesting we might publicly, though not as loudly as before, freeze cut 'n' dried illegality, but then use the "silent method" in "more ambiguous" cases? What is "more ambiguous"?

I can't, or, more accurately, don't have time to, find the Korean versions to confirm or deny anything, but if true, then were one to wonder why the U.S. government is viewed with suspicion in those sectors of society with a predisposition towards either left wing blinkers or believing conspiracy theories, there could be your answer.