Well, personally my first thought after reading the summary was "but how do you trust the BIOS?" A few years ago I'd have immediately said that's conspiracy theory and dismissed it (along with the other items you listed). But after a year of exposure to the Snowden and RSA revelations and everything else, it pains me to say these NSA questions aren't so far fetched any more.
Sure they may not be probable but they could be possible. No matter how rational you think you are, it really messes with one's mind. Subtle paranoia, if you will.