It's preposterous to still be searching for reasons to justify the invasion.
Also read this investigation regarding Latif's dubious claims: http://www.edcaesar.co.uk/article.php?article_id=55
Even if the book is mostly a fabrication, the film captures well Uday's behaviour and the world of Saddam's Iraq.
Not completely relevant to your discussion, but you might want to mention that it is likely the story isn't true.
After the slew of Iraq movies, all of them from the American soldiers perspective (Green Zone, The Hurt Locker, Three Kings) I found the subject matter of this film to be a refreshing change. What most people know or remember of Gulf war one, is completely overshadowed by Gulf war Two/ Iraqi Freedom. So to be able to go back in time and get a glimpse of Baghdad in it's hey day was a remarkable break from "Victory movies", this is the only movie about Iraq to date as seen from an Iraqi viewpoint. Yes, it's violent (not necessarily moreso than Saw, Texas chainsaw massacre et al) but then since it is a portrayal of events in a real persons life would you want it any other way? Dominic Cooper is just fantastic, he inhabits both characters flawlessly and for the most part you genuinely believe that he is two people.
As for the excess, obscenity, gratuitous violence and material wealth that some other reviewers have complained about, well, that was Bagdad in the '80's, does it have to be dressed up in Military Fatigues screaming "U.S.A" to be a good movie? If you liked Scarface, if you want an action packed ride, if you love depth of colour and sound in your movie. If you want to see great acting from Dominic Cooper, then this is the movie for you.
When you go see it, ask yourself, what would you have done in the same situation as the main character Latif Yahia? Could you have survived, because, unless you hadn't heard it is based on a true story.
Watch and Enjoy, I have watched it twice and want to watch it again because each time I watch it I can't believe it's over, I want more! Stories like this don't come around everyday. Unless of course you want to watch another Hurt Locker, it may have won a lot of Oscars but The Devil's Double deserves more. 10/10