In some sense, every email to or from a gmail user is an "open letter" to Eric Schmidt. (No, I'm not implying that that he or the typical Googler does or would review private email... only that some non-null set of employees there, probably including the CEO if he were really determined to do so, could .)
What is the point you're trying to make? One could use your argument for any single entity in the world. "I'm not implying that Coca Cola's CEO does or would put poison on the beverages, only that some non-null set of employees there, probably including the CEO if he were really determined to do so, could." Replace Google/review private email with anything and you'll have a meaningful sentence: Obama/release nukes, k…
Maybe it's time to stop being paranoid and start concentrating or real problems? Like pondering on how to create an e-book reader that doesn't suck or discovering how to cure AIDS and cancer efficiently?