My biggest problem with Daisey? The fact that the only thing he gains from his fabrications is self-aggrandizement.

So many of the things he claims to have seen aren't in essence untrue: hexane poisoning did happen, he just didn't meet (and tell a true story) about how. Underage workers do exist, but I think it is less than clear whether Daisy met any of them. Terrible abuses resulting in lasting, terrible physical damage (or death) clearly are occurring, but Daisey isn't the one uncovering them, he isn't the heroic reporter interviewing the victims to reveal their plight.

When Daisey defends his work, he's really defending himself as the champion of the oppressed. This, I think, is really about his ego, not about the plight of any abused Chinese worker.