Innocents were dying anyway. If that is your problem with the war, then we were doomed to fail regardless of what we did. Saddam was becoming a thorn in our side and he needed to go. We should have removed him earlier, but we eventually got around to it.
The disposing of Hussein only left the country with an equally corrupt, unstable and incompetent government. The worst part of the invasion was banning members of the Ba'ath party from Public Sector employment.
Rather then trying to play world policeman, we should bring our troops home and focus on national security. We were attacked by religious fanatics. And the next 10 years of occupation and invasion served only to put fuel on the fire.
The real reason was oil.
It was to costly in terms of life, money and our integrity.
There was reason to remove Saddam, but the reasons that the US decided to choose to justify going in were incorrect, and then after that, the US completely fucked up the end-game that caused so many other problems to start
They were no threat to our national security and we knew that it would be a civil war to which there would be no end.