Which other country do you think we should carpet bomb for freedom? There's no shortage of oppressive regimes in the world. We happily do business with many of them and, for economic reasons, manage to stay out of their domestic affairs. Placing profit over principles robs us of any moral authority we might delude ourselves into thinking we have.
Maybe we could try to liberate the nuclear armed countries first, no point in making the lives of people in Saudi Arabia more of a misery if our attempt to liberate China ends us all.
I can't take anyone seriously who tells me the Iranian government are liars but we should trust our own. Iraq is a perfect example of how our own government lies to us, they even commissioned the "sex up" dossier to convince us the UK was 45 minutes away from annihilation if we didn't act.
All governments lie, all the fucking time.
Wars of aggression are against international law, no matter how awful the government of a particular country may be.