Olbermann provides a valuable service. The tone of his piece is that the Bush administration is destroying the fabric of America, but the meat of the piece catalogs the presidents who've gone down this road before. John Adams, Woodrow Wilson, FDR and others have been granted the power to imprison American citizens on flimsy (if any) grounds, and all of them have ended up abusing it. And each time, the nation recovers.
So, yes, the Bush administration is acting reprehensibly, but America is stronger than the cowardice of the men who are currently running things.