Obama is not solely responsible for everything that goes on in the US government. The president's power is limited. However, since he is the figurehead of the state, it's only natural that citizens have the impression he is the mastermind behind every single negative action of the gubment.

I'm highly disappointed with Obama but he is hardly a psychopath. All those decisions you find repellent are the result of pressure from third parties or his own underlings. Impeaching Obama would be counter-productive. It would just create instability and would not solve the underlying problems that led him to make those decisions you hate.