Munger's quote.  On the face the quote seems very negative but he could be saying that finance is infested with rats and bitcoin is going to clear them all out.  Especially since it does have that potential.  I mean it was a very interesting choice of analogy out of infinite possibilities... this is a very clever guy and he's not about to drop a stock market tip on TV for free when he has paying customers that deserve his insight.  

Most likely he doesn't care one way or the other and just said it for laughs...