Snyder did nothing wrong.

Technically you're right but in real reality he did a few things wrong. Even though he made himself pretty clear with the doc he should have said "Get me out now, i'm not *beep* around, i need out now." His pride wouldn't allow it. He also should have asked or accepted the help offered when dealing with securing the missiles. He didn't because his pride wouldn't allow it. The rest i don't really blame him for, he was terrified to the core, it's the Navys fault for not psych checking him well enough to figure out how badly he'd cope with long term enclosure. It made him a d*ck, but not technically wrong.

Nope. He's an archetypical screwup. He'll claim to know how to do something rather than admit that he doesn't (missiles, shotgun, etc.). When in doubt, instead of checking with the person who gave him the task to ensure he's about to do the right thing, he asks for someone else's interpretation (missiles) and screws up. Nothing's ever his fault. I've worked with people just like this guy. They're poison to an organization.