You also seem to neglect that the government all over frequently takes advantage its position in ways that make things worse for society.
The thing about corporations, though, is that with minimal regulation, they can be forced to compete, and ultimately bad ones are orders of magnitude more likely to change or die than any given government. In fact I'd argue that a constant churn of negative companies is still better than some of of the worse tyrannical states that ever existed, by a large margin, because of the forces of competition.