(It says something that every time I criticize Google publicly I get a little scared because I know that flipping a bit in the Googleplex would cause my business to fold like an origami crane. Granted, they probably wouldn't play favorites with a site as small as mine. Probably.)
I trust the cops but I'm a big fan of having an adversarial process in place which reflexively distrusts them, because should the cops decide you're guilty for reasons fair or foul, the deck is otherwise incredibly stacked against you. I feel the same way about Google: they're a wonderful company, they've done more to improve the human experience than probably any other company in the last twenty years, and I assume every word out of their mouth is a lie until presented with evidence to the contrary. Note that if you do this you'll quickly clue onto the fact that aside from the meaningless PR about openness and self-righteousness about "evil" they are a ridiculously non-transparent company.
I wrote more about their arrogance here: http://alanhogan.com/arrogance-of-google
The answer for users is "don't trust Google with your information, and get as much of it out of Google's control as you can, even though you don't know how much there is and can't take some of it back."
But we knew that already. The question is "when will Google stop unethically publicizing all the information we don't forcibly remove from their control?"