In terms of sample size, I felt like it would be more impractical for the Foundation to waste a few hundred D-class for testing a Safe-class skip, which is why I kept it down. I originally had more tests than that, but people felt like it was tossing away too many D's, so I cut it down, even if it's not technically scientifically sound.
The spoon thing is a little silly, I admit.
The Moral Ambiguity Disorder is similar, but not entirely the same as PTSD. In this mindset, MAD more commonly describes a sense of cognitive dissonance, where the person knows what they're doing is wrong, but at the same time is right, due to the argument of "the greater good." Now, of course, not everyone likes utilitarianism, so of course, some people are very traumatized by that kind of thing. It's my own little spin of a disorder that I thought that I'd flesh out for the story.
Finally, what I was implying (and that people in chat seemed to get) was that Louef is far from healed of his problems. He's dealing with them, yes, but he's not over them by a long shot. Social events and games can help take his mind off of the crippling morality attack within him, but it's never going to fully cure his condition, because like most mental disorders, there is no real cure. The ending is somewhat bittersweet in that he's examining his issues, but realizing that he needs to move on and focus on other matters as well.
EDIT: This is supposed to be a reply to Kalinin