Exactly why are we in Iraq?

I have friends from Iraq who now lives in Australia and who is a Christian. The life her family lived was so horrible under Saddam it still gives me nightmare's thinking about her stories. There family was so happy when Bush decided to go into Iraq (she jumped around the room crying). We don't live over there so we all lucky enough not to be expose to the horrible action of saddam and his followers. My friend had 5 brothers and sisters, she now has 1 left. Her brothers and sisters died in front of her. All killed as a result of not following Saddams rules. Saddam supported Terrorism thats one of the reasons we are over there. Giving people like my friend and her family FREEDOM.