Shagia and Olba Frost's pitiful Freudian Excuses make a lot more sense when you remember that they're only 19. They're literally a pair of teenagers, drowning in their own Wangst.
Also, their apparent Karma Houdinis in the end are actually the best punishments for them. So they wanted to plunge the Crapsack World into war and despair due to said pitiful Freudian Excuses? Now, as they're back to square one and Shagia is confined to a wheelchair, they can only watch as everything and everyone else flourishes around them. That's either a Fate Worse Than Death (if they're not over their Wangst) or a Last-Second Chance (if they are)