How long before Saddam Hussein becomes a victim of unfortunate cirstance by the left?

He was a horrible person who committed many atrocities, but it still wasn't our place to invade a Sovereign nation for no reason, capture and with the istance of a mockery of a trial execute him. If we are meant to be the police of the world why aren't we doing something about the genocide in Darfur or something about N. Korea or any other despot who is killing his people?