Snarky, I think many people have this same point of view and I have always wondered how they can trust government on somethings but not others. Unaccountable power is always a danger to liberty, IMHO.
The point isn't that I trust the government more on some things, it's that I think certain exercises of government power (some of them decried by libertarians) are legitimate and benign. There should always be accountability.
And I would argue that a democratic government in a state with civil rights is often in practice more accountable than a corporation. For example, the government is divided into different branches, which are (when the system works) accountable to each other.
It's an inescapable fact that some people have power over others: the strong over the weak. Government is one expression of this fact, but not by far the only one (parents over their children, bosses over their workers, the rich over the poor, the armed over the unarmed, the smart over the stupid, the many over the few). The primary goal of the liberal project over the last several hundred years has been to equalize, regulate and balance these powers against each other (e.g. through the idea of divided government) in order to prevent or at least reduce abuses, which is one way to define liberty.
In the words of Cesar "Who will guard the guards?". 
That's actually the poet Juvenal.
