"In any event, Munger called Bitcoin “rat poison” (watch the interview here) and I found his choice of words quite telling. After all, rat poison is used to eliminate dangerous and unsanitary pests, namely rodents. So if Bitcoin is “rat poison,” who are the rats? I’d say the financial system itself. So if Bitcoin is the poison to eliminate the hopelessly corrupt and parasitic financial system I have to agree with Munger. Bitcoin is indeed rat poison."
From Michael Kriegers blog: http://libertyblitzkrieg.com/2014/05/07/as-wall-street-looks-to-copy-bitcoin-the-department-of-defense-studies-it-as-a-terrorist-threat/